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Porous Ti–Al Intermetallic Based Alloys Fabricated by Pressure-Sintering Elemental Powders with a Space Holder Powder 査読有り

Naoki Takata, Keisuke Uematsu, Makoto Kobashi

MRS Advances 2 巻 ( 26 ) 頁： 1387-1392 2017年1月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

In the present study, we have attempted to produce the porous Ti–Al intermetallic based alloys by pressure-sintering of the elemental powders of Ti and Al through a combustion reaction, with a NaCl space holder to achieve the development of a highly porous structure. The powders of Ti (particle size: <45 μm) and Al (particle size: <45 μm) were mixed to various total compositions of Ti–0-40 Al (at.%), and NaCl (particle size: 300-400 μm) was mixed with the Ti/Al powder to give a highly porous structure. The mixed powder was sintered at 700 oC under a constant pressure of 30 MPa to form cylindrical specimens with a diameter of 20 mm. The soaking of the specimens in pure water allows for the removal of NaCl (with a volume fraction of 60 %) and the formation of the pores to achieve a controlled relative density of 0.4. The present process can produce porous Ti–Al alloys with various compositions. In as-sintered Ti–Al specimens, an inhomogeneous microstructure consisting of Ti particles surrounded by the a Ti–Al alloy layer (various Ti–Al intermetallic phases) was observed. The as-sintered specimens exhibited the brittle behavior under compression, which is independent of their Al content. However, in a Ti–20Al alloy heat-treated at 1300 °C, a nearly Ti3Al single-phase microstructure appeared in the porous specimen. The heat-treated porous Ti–20Al alloy shows both a high plateau-strength level of approximately 100 MPa and a high plateau-end strain over 50%, resulting in a high absorption energy. The present results demonstrate that controlling the microstructure for the formation of the Ti3Al single-phase would be an effective method to achieve high energy absorption capacity of the porous Ti–Al alloy.

DOI： 10.1557/adv.2017.123

Solid Fe/Liquid Zn Interfacial Reaction of Hot-Dip Galvanized Dual-Phase Steels 査読有り

Naoki Takata, Makoto Kobashi, Masao Takeyama

Proceedings of the 9th Pacific Rim International Conference on Advanced Materials and Processing (PRICM9) 頁： 496-501 2016年8月

Solidification of Bcc/T1/T2 three-phase microstructure in Mo–Nb–Si–B alloys 査読有り

N. Takata, N. Sekido, M. Takeyama, J.H. Perepezko, M. Follett-Figueroa, C. Zhang

Intermetallics 72 巻頁： 1-8 2016年5月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

The three-phase, (Mo,Nb)ss/(Mo,Nb)5Si3/(Mo,Nb)5SiB2, Bcc/T1/T2 microstructures that develop in Mo–Nb–Si–B alloys have been examined in arc cast and directionally solidified samples to identify the phase sequencing during solidification. A Mo-32.6Nb-19.5Si-4.7B (at.%) alloy was directionally solidified using an optical floating zone (OFZ) furnace in a flowing Ar gas atmosphere at a constant growth rate of 10 mm/h. The microstructure of the directionally solidified alloy is characterized by an elongated T2 phase surrounded by bcc and T1 phases with an interwoven morphology From the evaluation of the microstructures in arc cast ingots of several alloys at a constant 32.6 at%Nb composition, the path of the liquidus valleys with decreasing temperature has been determined to intersect at a common point that establishes the solidification reaction as a eutectic. The incorporation of the experimental results into a computational thermodynamic analysis provides insight on the partitioning of components within each phase during solidification

DOI： doi:10.1016/j.intermet.2016.01.001

Mechanical properties of austenitic heat-resistant Fe–20Cr–30Ni–2Nb steel at ambient temperature 査読有り

Naoya Kanno, Kazuhiro Yoshimura, Naoki Takata, Imanuel Tarigan, Masao Takeyama

Materials Science and Engineering A 662 巻頁： 551–563 2016年4月

Nanoindentation study on solid solution softening of Fe-rich Fe2Nb Laves phase by Ni in Fe-Nb-Ni ternary alloys 査読有り

Naoki Takata, Hassan Ghassemi-Armaki, Masao Takeyama, Sharvan Kumar

Intermetallics 70 巻頁： 7-16 2016年3月

Microstructure Control of Dual-Phase Steels through Hot-Dip Al–Mg–Si Alloy Coating Process 査読有り

Naoki Takata, Tadashi Tsukahara, Satoru Kobayashi, Masao Takeyama

ISIJ International 56 巻 ( 2 ) 頁： 319–325 2016年2月

金属間化合物Fe2Al5 相およびFeAl3 相の室温における機械的性質査読有り

塚原　斉史，高田　尚記，小林　覚，竹山　雅夫

鉄と鋼 102 巻 ( 2 ) 頁： 89-95 2016年2月

Crystallography of Fe2Al5 phase at the interface between solid Fe and liquid Al 査読有り

Takata Naoki, Nishimoto Manamu, Kobayashi Satoru, Takeyama Masao

INTERMETALLICS 67 巻頁： 1-11 2015年12月

Growth of Fe2Al5 Phase on Pure Iron Hot-Dipped in Al-Mg-Si Alloy Melt with Fe in Solution 査読有り

Takata Naoki, Nishimoto Manamu, Kobayashi Satoru, Takeyama Masao

ISIJ INTERNATIONAL 55 巻 ( 7 ) 頁： 1454-1459 2015年7月

Tensile Properties of Austentiic Heat Resisntat Steel of Fe-20Cr-30Ni-2Nb at Ambient Temperature 査読有り

Naoki Takata, Naoya Kanno, Masao Takeyama

Proceedings of The 1st International Conference on Advanced High-Temperature Materials Technology for Sustainable and Reliable Power Engineering (123HiMAT-2015) 頁： 169-172 2015年6月

Stability of Sigma Phase at Elevaed Temperatures in Mn Added Fe-Cr-Ni Austenitic Heat Resistant Steels 査読有り

Yoshiki Kumagai, Naoki Takata, Satoru Kobayashi, Masao Takeyama

Proceedings of The 1st International Conference on Advanced High-Temperature Materials Technology for Sustainable and Reliable Power Engineering (123HiMAT-2015) 頁： 157-160 2015年6月

Creep of Super Advanced Fe-Cr-Ni-Nb Austenitic Heat Resistant Steels at 1073 K for A-USC Power Plant 査読有り

Shion Mise, Taro Osaka,Takahiro Kimura, Naoki Takata, Satoru Kobayashi, Masao Takeyama

Proceedings of The 1st International Conference on Advanced High-Temperature Materials Technology for Sustainable and Reliable Power Engineering (123HiMAT-2015) 頁： 165-168 2015年6月

Microstructural Characterization of Gamma Prime Precipitates in Wrought Ni-Based Superalloy Inconel X-750 査読有り

Hiromu Hisazawa, Yoshihiro Terada, Naoki Takata, Masao Takeyama

Proceedings of The 1st International Conference on Advanced High-Temperature Materials Technology for Sustainable and Reliable Power Engineering (123HiMAT-2015) 頁： 250-253 2015年6月

Effect of Ti Addition on the Formation of Fe2Nb (TCP) and Ni3Nb (GCP) Phases in Fe-20Cr-35Ni-2.5Nb Austenitic Heat Resistant Steel at 1073 K 査読有り

Hongmei Li, Fagang Gao, Naoki Takata, Satoru Kobayashi, Masao Takeyama

Proceedings of The 1st International Conference on Advanced High-Temperature Materials Technology for Sustainable and Reliable Power Engineering (123HiMAT-2015) 頁： 161-164 2015年6月

In-Situ Tensile Observation at 1073 K in Laves Phase Strengthened Fe-20Cr-30Ni-2Nb Steels 査読有り

Mari Yoshihara, Naoki Takata, Masao Takeyama

Proceedings of The 1st International Conference on Advanced High-Temperature Materials Technology for Sustainable and Reliable Power Engineering (123HiMAT-2015) 頁： 153-156 2015年6月

3D Observation of Grain Boundary Precipitation of Fe2Nb Laves Phase in a Novel Austenitic Heat Resistant Steel Fe-20Cr-35Ni-2.5Nb 査読有り

Fagang Gao, Naoki Takata, Satoru Kobayashi, Masao Takeyama

Proceedings of The 1st International Conference on Advanced High-Temperature Materials Technology for Sustainable and Reliable Power Engineering (123HiMAT-2015) 頁： 35-38 2015年6月

Ultrafine ferrite formation through cold-rolling and annealing of low-carbon dual-phase steel 査読有り

Yoshitaka Okitsu, Naoki Takata, Nobuhiro Tsuji

Journal of Materials Science & Technology 31 巻頁： 745-754 2015年3月

Crystallography of Bcc/T1/T2 Three-Phase Microstructure in the Directionally Solidified Mo-Nb-Si-B Alloy 査読有り

Naoki Takata, Nobuaki Sekido, Masao Takeyama, John H. Perepezko

Mater. Res. Soc. Symp. Proc. 1760 巻頁： mrsf14-1760-yy03-03 2015年3月

Morphology and formation of Fe-Al intermetallic layers on iron hot-dipped in Al-Mg-Si alloy melt 査読有り

Takata Naoki, Nishimoto Manamu, Kobayashi Satoru, Takeyama Masao

INTERMETALLICS 54 巻頁： 136-142 2014年11月

6111アルミニウム合金のリジング発生に及ぼす加工熱処理の影響とCube方位粒形成過程査読有り

池田賢一，宮田幸昌，吉原隆浩，高田尚記，中島英治

軽金属 64 巻 ( 8 ) 頁： 353-360 2014年8月

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