Tokushima University / Educator and Researcher Directory --- Hisazawa, Hiromu

Field of Study

○	Metallic Materials

Subject of Study

○	Microstructure control in Ni-based heat resistance alloys (Ni-based superalloys, microstructure control, image processing, transmission electron microscopy, heat treatment)

Book / Paper

Academic Paper (Judged Full Paper):

1.	Tatsuya Okada, Kenya Bando, Fumiya Iwaasa, Tomoyuki Ueki, Hiromu Hisazawa and Takuro Tomita : Boron ion implantation on femtosecond-laser-irradiated diamond surface, Japanese Journal of Applied Physics, Vol.61, No.10, 102002-1-102002-5, 2022. (Link to Publication Site) ● Publication site (DOI): 10.35848/1347-4065/ac8c29 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.35848/1347-4065/ac8c29 (DOI: 10.35848/1347-4065/ac8c29)
2.	Tatsuya Okada, Hiromu Hisazawa, Hiroki Morimoto, Kazuki Nakao, Ryota Okubo and Tomoyuki Ueki : Creep Fracture of Copper Tricrystal along Grain Boundaries, Materials Transactions, Vol.63, No.8, 1133-1137, 2022. (Summary) <p>The major objective of the present study was to investigate the creep fracture process of a copper tricrystal having 110 -tilt Σ3, 3, 9 grain boundaries. Creep tests at 0.81 T<sub>M</sub> (T<sub>M</sub>: melting temperature on the absolute temperature scale) under 4 MPa tensile stress were carried out for three samples prepared from the same tricrystal. Grain-boundary sliding occurred along only the Σ9 boundary, and the triple junction of the boundaries completely suppressed the sliding. The three samples were in different stages of creep deformation. Creep fracture was initiated by sliding-induced voids along the Σ9 boundary. Grain-boundary damage by the void formation developed into complete separation along the Σ9 boundary, and the Σ9 boundary crack induced surface grooves along one of the Σ3 boundaries, arranged almost perpendicular to the tensile axis. The crack propagation resulted in the final fracture of the tricrystal along the Σ9 and Σ3 boundaries. The formation of cavities in the Σ3 fracture surface suggested that the final fracture occurred in a ductile manner after the neighboring grains were partly separated along the Σ3 boundary.</p> (Keyword) tricrystal / copper / creep fracture / grain-boundary sliding / void / crack (Link to Publication Site) ● Publication site (DOI): 10.2320/matertrans.MT-M2022066 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390855809731163264 ● Search Scopus @ Elsevier (DOI): 10.2320/matertrans.MT-M2022066 (DOI: 10.2320/matertrans.MT-M2022066, CiNii: 1390855809731163264)
3.	Hiromu Hisazawa, Sakiko kashiwase and Yoshihiro Terada : Coherency evaluation of α-Mg/C15-Al2Ca interface for a Mg-Al-Ca alloy, Journal of Japan Institute of Light Metals, Vol.71, No.2, 127-129, 2021. (Keyword) magnesium alloy / C15-Al2Ca / aging / HRTEM / coherency (Link to Publication Site) ● Publication site (DOI): 10.2464/jilm.71.127 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85103617527 (DOI: 10.2464/jilm.71.127, Elsevier: Scopus)
4.	Tatsuya Okada, Hiromu Hisazawa, Akihiro Iwasaki, Katsuya Kawaguchi, Hiroki Morimoto, Kazuki Nakao, Tomoyuki Ueki and Takuro Tomita : Creep fracture of aluminum and copper tricrystals having <110>-tilt Σ3, 3, 9 grain boundaries, Materials Transactions, Vol.62, No.2, 239-245, 2021. (Link to Publication Site) ● Publication site (DOI): 10.2320/matertrans.MT-M2020325 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.2320/matertrans.MT-M2020325 (DOI: 10.2320/matertrans.MT-M2020325)
5.	Tatsuya Okada, Yuki Fuchikami, Kazuki Mimura, Tomoyuki Ueki, Hiromu Hisazawa and Takuro Tomita : Formation of ohmic Ni electrodes on femtosecond laser-modified 4H-SiC surface, Applied Physics. A, Materials Science & Processing, Vol.126, No.7, 535-1-535-7, 2020. (Link to Publication Site) ● Publication site (DOI): 10.1007/s00339-020-03733-w (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85086631907 (DOI: 10.1007/s00339-020-03733-w, Elsevier: Scopus)
6.	Sakiko Kashiwase, Mariko Unekawa, Hiromu Hisazawa and Yoshihiro Terada : C15-Al₂Ca Precipitation in a Mg-Al-Ca Alloy, Materials Transactions, Vol.61, No.2, 375-380, 2020. (Summary) <p>The coarsening kinetics of a fine C15Al<sub>2</sub>Ca Laves phase with a plate-like morphology precipitated within the primary α-Mg grains were investigated for Mg5Al1.5Ca alloy aged at 523 K. The Al<sub>2</sub>Ca precipitate coarsened as its coherence was retained in the aging time below 300 h, and a quantitative relationship was obtained between precipitate length (<i>l</i>) and aging time (<i>t</i>) as <i>l</i> <i>t</i><sup>0.23</sup>. However, the α/C15 coherent interface changed into a semi-coherent interface by introduction of misfit dislocations on the planar surface of the precipitates in the aging time above 300 h, which resulted in the promotion of Al<sub>2</sub>Ca coarsening. The Al<sub>2</sub>Ca phase was assumed to precipitate through a nucleation and growth mechanism rather than spinodal decomposition, and its coarsening was explained using the terrace-ledge-kink mechanism. The result shows that the aspect ratio of the Al<sub>2</sub>Ca precipitates was predominantly determined by the aging temperature, and it decreased at higher aging temperatures.</p><p></p><p>This Paper was Originally Published in Japanese in J. Japan Inst. Met. Mater. <b>83</b> (2019) 282287.</p> (Keyword) magnesium alloy / Laves phase / HRTEM / coarsening / coherency (Link to Publication Site) ● Publication site (DOI): 10.2320/matertrans.MT-M2019291 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390283659846040064 ● Search Scopus @ Elsevier (DOI): 10.2320/matertrans.MT-M2019291 (DOI: 10.2320/matertrans.MT-M2019291, CiNii: 1390283659846040064)
7.	Tatsuya Okada, Takuro Tomita, Hiroyuki Katayama, Yuki Fuchikami, Tomoyuki Ueki, Hiromu Hisazawa and Yasuhiro Tanaka : Local melting of Au/Ni thin films irradiated by femtosecond laser through GaN, Applied Physics. A, Materials Science & Processing, Vol.125, No.10, 690-1-690-6, 2019. (Link to Publication Site) ● Publication site (DOI): 10.1007/s00339-019-2982-1 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1007/s00339-019-2982-1 (DOI: 10.1007/s00339-019-2982-1)
8.	Sakiko Kashiwase, Mariko Unekawa, Hiromu Hisazawa and Yoshihiro Terada : Three-Dimensional Morphology of C15-Al₂Ca Precipitates in a Mg-Al-Ca Alloy, Materials Transactions, Vol.60, No.9, 2048-2052, 2019. (Summary) <p>The three-dimensional morphology and thickness of an Al<sub>2</sub>Ca Laves phase with a C15 crystal structure, which precipitated within the primary α-Mg grain of a Mg5Al1.5Ca alloy that had been over-aged at 523 K for 100 h, were investigated using high-resolution transmission electron microscopy. The C15Al<sub>2</sub>Ca precipitate exhibits a hexagonal plate-like morphology, with a planar surface parallel to the (0001)<sub>α</sub> basal plane and the sides of the hexagonal plate parallel to the {11<span style="text-decoration: overline;">2</span>0} second columnar plane of the α matrix. A typical coffee bean contrast was clearly visible around the precipitate, which is indicative of the coherent precipitation of the C15Al<sub>2</sub>Ca phase with respect to the α-Mg matrix. The thickness of the Al<sub>2</sub>Ca precipitate, which corresponds to six layers of the (111)<sub>C15</sub> plane composed of Ca atoms, was evaluated as approximately 1.5 nm.</p><p> </p><p>This Paper was Originally Published in Japanese in J. Japan Inst. Met. Mater. <b>83</b> (2019) 193197.</p> (Keyword) magnesium alloy / die-cast / Laves phase / Morphology (Link to Publication Site) ● Publication site (DOI): 10.2320/matertrans.MT-M2019149 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390001288157993728 ● Summary page in Scopus @ Elsevier: 2-s2.0-85071417878 (DOI: 10.2320/matertrans.MT-M2019149, CiNii: 1390001288157993728, Elsevier: Scopus)
9.	Sakiko Kashiwase, Mariko Unekawa, Hiromu Hisazawa and Yoshihiro Terada : Coarsening of Plate-Like C15/Al2Ca Precipitates in a Mg-Al-Ca Alloy, Journal of the Japan Institute Metals, Vol.83, No.8, 282-287, 2019. (Summary) The coarsening kinetics of the fine C15Al2Ca Laves phase with a plate-like morphology, which precipitated within the primary α-Mg grains, were investigated for the Mg5Al1.5Ca alloy aged at 523 K. The Al2Ca precipitate coarsened with remaining coherency in the aging time below 300 h, and the quantitative relationship was obtained between precipitate length, <i>l</i>, and aging time, <i>t</i>, as follows; <i>l</i> <i>t</i> <sup>0.23</sup>. By contrast, the α/C15 coherent interface turned to the semi-coherent one by the introduction of misfit dislocations on the planar surface of the precipitates in the aging time above 300 h, which resulted in the promotion of Al<sub>2</sub>Ca coarsening. The Al<sub>2</sub>Ca phase was deduced to precipitate through a nucleation and growth mechanism rather than spinodal decomposition, and its coarsening was explained using the terrace-ledge-kink mechanism. The aspect ratio of Al<sub>2</sub>Ca precipitates was predominantly decided by the aging temperature, and it decreased at higher aging temperatures. (Keyword) magnisium alloy / laves phase / microstructure / high-resolution transmission electron microscopy / coherency (Link to Publication Site) ● Publication site (DOI): 10.2320/jinstmet.J2019022 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390282763131482496 ● Search Scopus @ Elsevier (DOI): 10.2320/jinstmet.J2019022 (DOI: 10.2320/jinstmet.J2019022, CiNii: 1390282763131482496)
10.	Sakiko Kashiwase, Mariko Unekawa, Hiromu Hisazawa and Yoshihiro Terada : Three-Dimensional Morphology of C15-Al2Ca Precipitates in a Mg-Al-Ca Alloy, Journal of the Japan Institute Metals, Vol.83, No.6, 193-197, 2019. (Summary) The three-dimensional morphology and thickness of the C15-Al2-Ca Laves phase, which precipitated within the primary -Mg grains, were investigated for the Mg 5Al 1.5Ca alloy over-aged at 523 K for 100 h using the high-resolution transmission electron microscopy (HRTEM). The C15-Al2Ca phase precipitated with a hexagonal plate-like morphology along the (0001) basal plane of the Mg matrix phase, where the sides of the hexagonal plates were parallel to the second columnar plane {11-20} of the matrix. The typical coffee bean contrast was clearly visible around the precipitates, indicative of coherent precipitation of the C15-Al2Ca phase. The thickness of the C15-Al2Ca precipitates, which corresponds to the six layers of (111) C15 plane composed of Ca atoms, was evaluated to be approximately 1.5 nm. (Keyword) magnesium alloy / die-cast / Laves phase / high-resolution transmission electron microscopy (HRTEM) / morphology (Tokushima University Institutional Repository) ● Metadata: 115406 (Link to Publication Site) ● Publication site (DOI): 10.2320/jinstmet.J2019009 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390001288139426432 ● Search Scopus @ Elsevier (DOI): 10.2320/jinstmet.J2019009 (Tokushima University Institutional Repository: 115406, DOI: 10.2320/jinstmet.J2019009, CiNii: 1390001288139426432)
11.	Arata Iwamaru, Hiromu Hisazawa and Yoshihiro Terada : Microstructure Evolution of Fe-Ni-Based Alloy HR6W during Isothermal Aging, Materials Transactions, Vol.60, No.5, 824-829, 2019. (Link to Publication Site) ● Publication site (DOI): 10.2320/matertrans.M2019032 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390001288133492736 ● Summary page in Scopus @ Elsevier: 2-s2.0-85065411907 (DOI: 10.2320/matertrans.M2019032, CiNii: 1390001288133492736, Elsevier: Scopus)
12.	Yoshiya Yamaguchi, Hiromu Hisazawa and Yoshihiro Terada : Microstructure Quantification in Nickel-Based Superalloy Udimet 720Li, Materials Transactions, Vol.60, No.4, 593-601, 2019. (Link to Publication Site) ● Publication site (DOI): 10.2320/matertrans.M2018389 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390282763115529856 ● Summary page in Scopus @ Elsevier: 2-s2.0-85063529286 (DOI: 10.2320/matertrans.M2018389, CiNii: 1390282763115529856, Elsevier: Scopus)
13.	Tatsuya Okada, Hiromu Hisazawa, Akihiro Iwasaki, Shota Amimoto, Jun Miyaji, Masaki Shisawa and Tomoyuki Ueki : Grain-Boundary Sliding and its Accommodation at Triple Junctions in Aluminum and Copper Tricrystals, Materials Transactions, Vol.60, No.1, 86-92, 2019. (Link to Publication Site) ● Publication site (DOI): 10.2320/matertrans.M2018296 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.2320/matertrans.M2018296 (DOI: 10.2320/matertrans.M2018296)
14.	Arata Iwamaru, Hiromu Hisazawa and Yoshihiro Terada : Precipitation Behavior of Wrought Fe-Ni-Based Alloy HR6W, Journal of the Japan Institute Metals, Vol.83, No.1, 30-35, 2019. (Summary) Age-hardening behavior of Fe-Ni-based alloy HR6W was investigated at the temperature range between 973 K and 1073 K. Two-step increase in hardness is detected for the alloy at each temperature; the first increase in hardness results from the precipitation of M23C6 phase and the second one corresponds to that of Laves phase. The TTP (time-temperature precipitation) diagram for the alloy is established based on the results of hardness measurement and microstructure observation, where the precipitation of Laves phase is slower than that of M<sub>23</sub>C<sub>6</sub> phase by three orders of magnitude and the nose temperature of Laves phase is above 1073 K. The M<sub>23</sub>C<sub>6</sub> phase precipitates with plate-like morphology along grain-boundaries at the early stage of aging, followed by the precipitation of Laves phase with granular morphology with increasing aging time. It is found that the M<sub>23</sub>C<sub>6</sub> and Laves phases are aligned under stress condition, due to their precipitation on the dislocations introduced during creep deformation. (Keyword) iron-nickel-based alloy / age-hardening / microstructure / Laves phase / time-temperature precipitation (TTP) diagram (Tokushima University Institutional Repository) ● Metadata: 115405 (Link to Publication Site) ● Publication site (DOI): 10.2320/jinstmet.J2018046 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390001288103888384 ● Search Scopus @ Elsevier (DOI): 10.2320/jinstmet.J2018046 (Tokushima University Institutional Repository: 115405, DOI: 10.2320/jinstmet.J2018046, CiNii: 1390001288103888384)
15.	Tatsuya Okada, Takuro Tomita, Tomoyuki Ueki, Takuya Hashimoto, Yuki Fuchikami, Hiroyuki Katayama, Hiromu Hisazawa and Yasuhiro Tanaka : Femtosecond-laser-induced modifications on a 4H-SiC surface and their application to low-temperature diffusion at the Ni/SiC interface, Japanese Journal of Applied Physics, Vol.57, No.11, 116501-1-116501-7, 2018. (Link to Publication Site) ● Publication site (DOI): 10.7567/JJAP.57.116501 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.7567/JJAP.57.116501 (DOI: 10.7567/JJAP.57.116501)
16.	Hiromu Hisazawa, Asahi Nomoto and Yoshihiro Terada : Dislocation analysis of a Mgla alloy by transmission electron microscopy, Journal of Japan Institute of Light Metals, Vol.68, No.10, 552-554, 2018. (Summary) <p>The dislocation structure was analyzed in a Mg 4.98Al 1.46Ca (mass%) alloy using invisible criterion with transmission electron microscopy. Basal and non-basal segment of dislocation induced during die-casting is determined as much a and a few a+c dislocation. After the aging at 523 for 10 and tensile deformation at 473, only basal a dislocation can be observed. This dislocation structure is not observed in crept specimens, which support the difference in dominant strengthening mechanism between creep and tensile deformation.</p> (Keyword) magnesium alloy / die-cast / dislocation / transmission electron microscopy (Tokushima University Institutional Repository) ● Metadata: 115404 (Link to Publication Site) ● Publication site (DOI): 10.2464/jilm.68.552 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390845713025398016 ● Search Scopus @ Elsevier (DOI): 10.2464/jilm.68.552 (Tokushima University Institutional Repository: 115404, DOI: 10.2464/jilm.68.552, CiNii: 1390845713025398016)
17.	Yoshiya Yamaguchi, Hiromu Hisazawa and Yoshihiro Terada : Microstructure Quantification in Wrought Ni-Based Superalloy Udimet 720Li, Journal of the Japan Institute Metals, Vol.82, No.10, 375-383, 2018. (Summary) <p>The morphology of <i>γ</i>' precipitates was quantitatively evaluated for wrought Ni-based superalloy Udimet 720Li by using the absolute moment invariant technique. The diameter of secondary <i>γ</i>' precipitates, <i>d</i>, increases continuously with the decrease of cooling rate, <i>v</i>, after the solution treatment at 1473 K/1 h along the following equation; <i>d</i> ∝ <i>v</i><sup>-0.4</sup>. It is found that the secondary <i>γ</i>' precipitates changes from spherical to octo-dendrite in shape with the decrease of cooling rate. In the case of oil-quenched alloy after the solution treatment, the value of <i>d</i> continuously increases with aging time at 1173 K, while the spherical shape remains unchanged during aging. On the contrary, for the furnace-cooled alloy, the shape of secondary <i>γ</i>' precipitates evolves from octo-dendrite to spherical in shape with aging time under the almost constant value of <i>d</i>.</p> (Keyword) nickel-based superalloy / gamma prime / microstructure / morphology / aging (Link to Publication Site) ● Publication site (DOI): 10.2320/jinstmet.JAW201801 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390845713001879680 ● Search Scopus @ Elsevier (DOI): 10.2320/jinstmet.JAW201801 (DOI: 10.2320/jinstmet.JAW201801, CiNii: 1390845713001879680)
18.	Asahi Nomoto, Sakiko Kashiwase, Kyosuke Nakagawa, Hiromu Hisazawa and Yoshihiro Terada : Strengthening of Mg-Al-Ca Die-Cast Alloy with Fine C15-Al<sub>2</sub>Ca Precipitates, Journal of the Japan Institute Metals, Vol.82, No.4, 94-101, 2018. (Summary) <p>Age-hardening behavior of a Mg-4.98Al-1.46Ca (mass%) die-cast alloy was investigated at the temperature range between 473 and 623 K. Transmission electron microscopy shows that fine C15-Al<sub>2</sub>Ca precipitates with a disc-shaped morphology are placed on the (0001) basal plane of the <i></i>-Mg matrix phase at the 523 K/10 h peak-aged condition, while they coarsen at the 623 K/100 h over-aged condition. The ultimate tensile strength of the peak-aged alloy is usually higher than that of the over-aged alloy for approximately 40 MPa at both 298 and 473 K, indicating that the precipitation strengthening by fine C15-Al<sub>2</sub>Ca precipitates is operative even at high temperatures. Dislocations are introduced within the <i></i>-Mg matrix phase of the alloy during die-casting; the dislocations are mostly <b><i>a</i></b> type and the dislocation segments are mainly located on the (0001) basal plane. The interrelation between fine C15-Al<sub>2</sub>Ca precipitates and dislocations during tensile deformation is discussed based on the results of tensile tests.</p> (Keyword) magnesium alloy / age-hardening / Laves phase / tensile strength / dislocation (Link to Publication Site) ● Publication site (DOI): 10.2320/jinstmet.JBW201702 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390282681467348992 ● Search Scopus @ Elsevier (DOI): 10.2320/jinstmet.JBW201702 (DOI: 10.2320/jinstmet.JBW201702, CiNii: 1390282681467348992)
19.	Hiromu Hisazawa, Terada Yoshihiro and Takeyama Masao : Morphology Evolution of γ' precipitates during Isothermal Exposure in Wrought Ni-based Superalloy Inconel X-750, Materials Transactions, Vol.58, No.5, 817-824, 2017. (Keyword) nickel-based alloy / gamma prime / morphology / lattice misfit (Tokushima University Institutional Repository) ● Metadata: 115402 (Link to Publication Site) ● Publication site (DOI): 10.2320/matertrans.M2016376 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85018688070 (Tokushima University Institutional Repository: 115402, DOI: 10.2320/matertrans.M2016376, Elsevier: Scopus)
20.	Hiromu Hisazawa, Terada Yoshihiro, Adziman Fauzan, Crudden J. David, Collins M. David, Armstrong E.J. David and Reed C. Roger : The Effect of Nb/Ti Ratio on Hardness in High Strength Ni-based Superalloys, Metals, Vol.7, 71, 2017. (Keyword) Superalloy / nanoindentation / age-hardening / Nb/Ti ratio (Tokushima University Institutional Repository) ● Metadata: 115401 (Link to Publication Site) ● Publication site (DOI): 10.3390/met7030071 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85014582592 (Tokushima University Institutional Repository: 115401, DOI: 10.3390/met7030071, Elsevier: Scopus)
21.	Hiromu Hisazawa and Yoshihiro Terada : Effect of Ti and Al Contents on γ Morphology in Wrought Ni-based Superalloys, Journal of the Japan Institute Metals, Vol.81, No.5, 244-250, 2017. (Summary) The effect of the content of Ti and Al on the morphology of γ precipitates is examined for 13 kinds of Ni-based model alloys aged at 1073 K/100 h. The morphology of γ precipitates was evaluated using the absolute moment invariants technique. The magnitude of cuboidal for γ particles clearly depends on the lattice misfit, but does not depend on the volume fraction of the particles. More γ particles tend to form a flat and parallel interface pair or elongated shape when the Ti and Al content is increased. These results suggest that the lattice misfit makes γ particles cuboidal and volume fraction strengthens their interaction, leading to a unique morphology. (Keyword) nickel-based alloy / gamma prime / morphology / lattice misfit / Ti-Al ratio (Tokushima University Institutional Repository) ● Metadata: 115403 (Link to Publication Site) ● Publication site (DOI): 10.2320/jinstmet.J2016062 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390282681468604928 ● Summary page in Scopus @ Elsevier: 2-s2.0-85018832042 (Tokushima University Institutional Repository: 115403, DOI: 10.2320/jinstmet.J2016062, CiNii: 1390282681468604928, Elsevier: Scopus)

Academic Letter:

1.	Tatsuya Okada, Takuro Tomita, Tomoyuki Ueki, Takuya Hashimoto, Hiroki Kawakami, Yuki Fuchikami, Hiromu Hisazawa and Yasuhiro Tanaka : Low-temperature diffusion assisted by femtosecond laser-induced modifications at Ni/SiC interface, Applied Physics Express, Vol.11, No.1, 016502-1-016502-4, 2018. (Link to Publication Site) ● Publication site (DOI): 10.7567/APEX.11.016502 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1360284924860328960 ● Summary page in Scopus @ Elsevier: 2-s2.0-85039981004 (DOI: 10.7567/APEX.11.016502, CiNii: 1360284924860328960, Elsevier: Scopus)

Proceeding of International Conference:

1.	Kenya Bando, Tomoyuki Ueki, Hiromu Hisazawa, Takuro Tomita, Tatsuya Okada and Makoto Yamaguchi : Modifications induced by femtosecond laser irradiation on (001) surface of diamond crystal, The 22nd International Symposium on Laser Precision Microfabrication, 97, Online, Jun. 2021.
2.	Tatsuya Okada, Takuro Tomita, Yuki Fuchikami, Yusaku Mizuo, Hiromu Hisazawa and Yasuhiro Tanaka : Formation of Ohmic Contact at Ni/SiC Interface with the Assistance of Femtosecond-Laser-Induced Modifications, International Conference on Materials and Systems for Sustainability 2019, A3-P-8-(1040), Nagoya, Nov. 2019.

Proceeding of Domestic Conference:

1.	佐藤健次, Tatsuya Okada and Hiromu Hisazawa : 高強度Ni基合金のマルチモーダル組織におけるTi/Nbの分配と析出挙動, 日本金属学会中国四国支部第63回講演大会講演概要集, B04, Aug. 2023.
2.	鴨頭勇斗, Tatsuya Okada and Hiromu Hisazawa : Ni-Al 合金における拡散対を用いた傾斜体積率試料の作製, 日本金属学会中国四国支部第63回講演大会講演概要集, B03, Aug. 2023.
3.	家根啓文, Tomoyuki Ueki, Hiromu Hisazawa and Tatsuya Okada : <110>傾角Σ3,3,9粒界を有するAl-Ag合金三重結晶のクリープ変形, 日本金属学会中国四国支部第63回講演大会講演概要集, B02, Aug. 2023.
4.	宮田崇貴, 横内陽来, Tomoyuki Ueki, Hiromu Hisazawa and Tatsuya Okada : Al-Ag合金単結晶における高温すべり変形, 日本金属学会中国四国支部第63回講演大会講演概要集, B01, Aug. 2023.
5.	村上大介, Tomoyuki Ueki, Hiromu Hisazawa, Takuro Tomita and Tatsuya Okada : フェムト秒レーザ照射を応用した4H-SiC上のNIオーミック電極形成, 日本金属学会中国四国支部第63回講演大会講演概要集, A14, Aug. 2023.
6.	櫻井雄弥, 岩浅郁哉, Tomoyuki Ueki, Hiromu Hisazawa, Takuro Tomita and Tatsuya Okada : フェムト秒レーザ照射したダイヤモンド単結晶へのn型イオン注入, 日本金属学会中国四国支部第63回講演大会講演概要集, A15, Aug. 2023.
7.	岸田崇秀, Tomoyuki Ueki, Hiromu Hisazawa, Takuro Tomita and Tatsuya Okada : フェムト秒レーザ照射したSiC表面におけるNiシリサイド形成, 日本金属学会中国四国支部第65回講演大会講演概要集, B15, Aug. 2022.
8.	岩浅郁哉, Tomoyuki Ueki, Hiromu Hisazawa, Takuro Tomita and Tatsuya Okada : ダイヤモンド表面に形成したフェムト秒レーザ誘起改質によるホウ素イオン導入促進, 日本金属学会中国四国支部第65回講演大会講演概要集, B14, Aug. 2022.
9.	日下大輔, Tatsuya Okada and Hiromu Hisazawa : 様々な大きさの格子ミスフィットを有するNi基モデル合金におけるγ′相の特異な配列と粒子径分布, 日本金属学会中国四国支部第65回講演大会講演概要集, A02, Aug. 2022.
10.	大久保隆太, Tomoyuki Ueki, Hiromu Hisazawa and Tatsuya Okada : <110>傾角Σ3,3,9粒界を有するCu-Al合金三重結晶のクリープ変形と破壊, 日本金属学会中国四国支部第65回講演大会講演概要集, A01, Aug. 2022.
11.	Hiromu Hisazawa : The Challenge of rationally evaluation on the two phase metallurgical structure starting from Ni-based alloys, 日本金属学会·日本鉄鋼協会中国四国支部, 共催軽金属学会中国四国支部第 50 回「若手フォーラム」, Feb. 2022.
12.	中尾和輝, Tomoyuki Ueki, Hiromu Hisazawa and Tatsuya Okada : <110>傾角Σ3,3,9粒界を有する銅三重結晶の粒界すべりに伴うクリープ破壊, 日本金属学会2021年秋期講演(第169回)大会講演概要集, 38, Sep. 2021.
13.	小川倖平, Takuro Tomita, Hiromu Hisazawa and Tatsuya Okada : フェムト秒レーザ誘起改質を導入した SiC 単結晶表面における Ni 電極形成, 日本金属学会中国四国支部第61回講演大会講演概要集, A16, Aug. 2021.
14.	猪子麟太郎, Tomoyuki Ueki, Hiromu Hisazawa and Tatsuya Okada : <110>傾角 Σ3,3,9 粒界を有する Al-Cu 固溶合金三重結晶のクリープ変形, 日本金属学会中国四国支部第61回講演大会講演概要集, A01, Aug. 2021.
15.	小川倖平, Hiromu Hisazawa, Takuro Tomita and Tatsuya Okada : フェムト秒レーザ照射した4H-SiC表面におけるNi電極の電流-電圧特性, 2021年度応用物理・物理系学会中国四国支部合同学術講演会, Fp-5, Jul. 2021.
16.	Hiromu Hisazawa, Yoichiroh Nakamura, Kohei Umeda, Tomoyuki Ueki and Tatsuya Okada : The Dispersion of γ Precipitate and its Dependence on Volume Fraction in NiAl Binary Alloy, 日本金属学会日本金属学会2021年春期(第168回)講演大会概要集, 166, Mar. 2021. (Keyword) Ni基超合金 / 格子ミスフィット / マイクロメカニクス / γ′相 / image processing
17.	森本博己, 川口克哉, 中尾和輝, 大西厚徳, Tomoyuki Ueki, Hiromu Hisazawa and Tatsuya Okada : 純Cuおよび純Al中のΣ3,3,9対応粒界三重線におけるクリープ損傷, 日本金属学会2020年秋期講演(第167回)講演概要集, 303, Sep. 2020.
18.	坂東賢哉, Tomoyuki Ueki, Takuro Tomita, Hiromu Hisazawa, Tatsuya Okada, 小林幸雄 and 伊藤元雄 : ダイヤモンド単結晶表面へのフェムト秒レーザ照射誘起改質導入とホウ素イオン注入, 日本金属学会中国四国支部第60回講演大会講演概要集, B05, Aug. 2020.
19.	中尾和輝, 森本博己, 川口克哉, Tomoyuki Ueki, Hiromu Hisazawa and Tatsuya Okada : <110>傾角Σ3,3,9三重線を有する純銅および純アルミニウム三重結晶のクリープ破壊, 日本金属学会中国四国支部第60回講演大会講演概要集, B04, Aug. 2020.
20.	坂東賢哉, Tomoyuki Ueki, Takuro Tomita, Hiromu Hisazawa, Tatsuya Okada, 小林幸雄 and 伊藤元雄 : フェムト秒レーザ照射したダイヤモンド表面へのホウ素イオン注入, 2020年度応用物理・物理系学会中国四国支部合同学術講演会講演概要集, Cp-2, Aug. 2020.
21.	Hiromu Hisazawa and Tatsuya Okada : Quantitative Analysis on Morphology of γ Precipitate in Ni-based Alloy Whose Lattice Misfit is Controlled with Ti/Al Ratio, Abstracts of The Japan Institute of Metals and Materials (JIM) Annual Autumn Meeting 2019, 282, Sep. 2019. (Keyword) Ni-based superalloy / Lattice misfit / image processing / Ti/Al ratio
22.	長野慎也, Tatsuya Okada and Hiromu Hisazawa : Ni基合金におけるマイクロメカニクスを用いたγ′相の析出形態に影響を及ぼす要素の抽出, 日本金属学会中国四国支部第59回講演大会講演概要集, A06, Aug. 2019.
23.	森本博己, Tomoyuki Ueki, Hiromu Hisazawa and Tatsuya Okada : 純銅Σ3,3,9対応粒界三重線近傍のクリープ変形初期段階, 日本金属学会中国四国支部第59回講演大会講演概要集, B04, Aug. 2019.
24.	水尾優作, 渕上裕暉, Hiromu Hisazawa, Takuro Tomita and Tatsuya Okada : SiC単結晶表面におけるフェムト秒レーザ照射誘起改質を応用したNi電極の作製, 日本金属学会中国四国支部第59回講演大会講演概要集, B08, Aug. 2019.
25.	川口克哉, 岩﨑旭紘, Tomoyuki Ueki, Hiromu Hisazawa and Tatsuya Okada : <110>傾角Σ3,3,9対応粒界を有するアルミニウム三重結晶のクリープ変形初期段階, 日本金属学会中国四国支部第59回講演大会講演概要集, A02, Aug. 2019.
26.	内田健介, 今垣諒彌, Tomoyuki Ueki, Hiromu Hisazawa, Takuro Tomita, Tatsuya Okada and 田中康弘 : ダイヤモンド単結晶表面におけるフェムト秒レーザ照射誘起改質とTiの反応, 日本金属学会中国四国支部第59回講演大会講演概要集, B25, Aug. 2019.
27.	内田健介, 今垣諒彌, Tomoyuki Ueki, Hiromu Hisazawa and Tatsuya Okada : ダイヤモンド単結晶表面に導入したフェムト秒レーザ照射誘起改質とTi薄膜の反応, 2019年度応用物理・物理系学会中国四国支部合同学術講演会講演予稿集, Fa-7, Jul. 2019.
28.	水尾優作, 渕上裕暉, Takuro Tomita, Hiromu Hisazawa and Tatsuya Okada : フェムト秒レーザ照射誘起改質を導入したSiC単結晶上Ni電極の特性評価, 2019年度応用物理・物理系学会中国四国支部合同学術講演会講演予稿集, Fp-4, Jul. 2019.
29.	水尾優作, 渕上裕暉, Takuro Tomita, Hiromu Hisazawa and Tatsuya Okada : フェムト秒レーザ照射誘起改質を応用したNi/SiC界面における電極形成, 2019年第66回応用物理学会春季学術講演会講演予稿集, 9a-W631-2, Mar. 2019.
30.	Hiromu Hisazawa and Tatsuya Okada : Ni基合金におけるγ′析出相の分散に及ぼす格子ミスフィットの影響, 日本金属学会2018年秋期(第163回)講演大会概要集, 57, Sep. 2018.
31.	岩﨑旭紘, 網本翔太, Tomoyuki Ueki, Hiromu Hisazawa and Tatsuya Okada : <110>傾角Σ3,3,9粒界を有する純Alおよび純Cu三重結晶における粒界すべり, 日本金属学会2018年秋期講演大会講演概要集, 91, Sep. 2018.
32.	岩﨑旭紘, 網本翔太, Tomoyuki Ueki, Hiromu Hisazawa and Tatsuya Okada : <110>傾角Σ3,3,9粒界を有する純Alおよび純Cu三重結晶のクリープ変形, 日本金属学会中国四国支部第58講演大会講演概要集, 52, Aug. 2018.
33.	渕上裕暉, Tomoyuki Ueki, Takuro Tomita, Hiromu Hisazawa, Tatsuya Okada and 田中康弘 : フェムト秒レーザ照射改質の導入によるNi/SiC界面のNiシリサイド形成, 日本金属学会中国四国支部第58回講演大会講演概要集, 26, Aug. 2018.
34.	今垣諒彌, Tomoyuki Ueki, Takuro Tomita, Hiromu Hisazawa, Tatsuya Okada and 田中康弘 : ダイヤモンド表面へのフェムト秒レーザ照射改質の導入によるTi/ダイヤモンド界面反応, 日本金属学会中国四国支部第58回講演大会講演概要集, 25, Aug. 2018.
35.	今垣諒彌, Tomoyuki Ueki, Takuro Tomita, Hiromu Hisazawa, Tatsuya Okada and 田中康弘 : フェムト秒レーザ照射改質を導入したダイヤモンド表面へのTi蒸着, 2018年度応用物理・物理系学会中国四国支部合同学術講演会, 5, Aug. 2018.
36.	渕上裕暉, Tomoyuki Ueki, Takuro Tomita, Hiromu Hisazawa, Tatsuya Okada and 田中康弘 : 4H-SiC表面へのフェムト秒レーザ照射改質導入によるNi/SiC界面反応の促進, 2018年度応用物理・物理系学会中国四国支部合同学術講演会講演予稿集, 4, Aug. 2018.
37.	Hiromu Hisazawa and Yoshihiro Terada : γ/γ′2相組織を呈する耐熱Ni基合金における析出形態の評価手法, 日本鉄鋼協会・日本金属学会中国四国支部鉄鋼第 60 回・金属第 57 回合同講演大会, Aug. 2017. (Keyword) transmission electron microscopy / image processing

Et cetera, Workshop:

1.	Hiromu Hisazawa : 立方晶内に析出した整合析出物によるミスフィットひずみのモデリングと応用, 日本金属学会・日本鉄鋼協会中国四国支部第46回若手フォーラム, Dec. 2019.
2.	Hiromu Hisazawa : fcc を母相とする 2 相合金における析出物の形態の決定機構と強度の関係, 日本金属学会・日本鉄鋼協会中国四国支部第42回若手フォーラム, Dec. 2018.
3.	Hiromu Hisazawa : Ni 基・ Mg-Ca 基合金を例とした 2 相合金の析出形態の評価, 日本金属学会・日本鉄鋼協会中国四国支部第39回若手フォーラム, Feb. 2018.

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Assistant Professor : Hisazawa, Hiromu

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Grants-in-Aid for Scientific Research (KAKEN Grants Database @ NII.ac.jp)