Research topics の履歴ソース(No.19)

*Research topics [#a8ce471e]
&size(18){%%%Microstructure control based on the concept "Phase Stability"%%%};
#ref(http://t-nagase.sakura.ne.jp/EN/pict-new/KenkyuEN-00-02.PNG,left,around,nowrap,photo);
非平衡状態（高エネルギー状態、励起状態）から系が落ち込んでいく先には、~
平衡状態・準安定状態があります。~
したがって、~
(1) 非平衡状態の実現~
(2) 平衡・準安定状態への落ち込み~
を制御することで、様々な新金属材料を開発することが可能です。~
この「相安定性制御」の概念のもと、~
(1) 合金設計: 熱力学計算, 非経験的計算法, データベース~
(2) 組織観察（電子顕微鏡法）: その場観察, サイズ横断的観察~
(3) 組織制御: 凝固・鋳造法, 電子照射法~
による「新金属材料・工業材料の開発」を行っています。~
#clear

**(1) High Entropy Alloys [#je280903]
#ref(http://t-nagase.sakura.ne.jp/EN/pict-new/KenkyuEN-01-HEA.PNG,left,around,nowrap,photo);
-[[High Entropy Alloys]]
&br;　・[[Irradiation damage in High Entropy Alloys]]
&br;　・[[Solidification microstructure in High Entropy Alloys]]
&br;　・[[High Entropy Cast Iron]]
&br;　・[[High Entropy Alloys for metallic biomaterials]]
&br;　・[[Light-Weight High Entropy Alloys]]
&br;　・[[High Entropy Brass]]
&br;　・[[Liquid phase separation in High Entropy Alloys]]
#clear

**(2) Casting and solidification [#v1f15551]
#ref(http://t-nagase.sakura.ne.jp/EN/pict-new/KenkyuEN-02-Solidification.PNG,left,around,nowrap,photo);
-[[Solidification microstructure in Cast Iron]]~
-[[In-situ TEM observation of the dendrite nucleation and growth]]~
-[[Solidification microstructure in High Entropy Alloys]]~
-[[Liquid phase separation]]
&br;　・[[Liquid phase separation in Ti-based alloys]]
&br;　・[[Liquid phase separation in High Entropy Alloys]]
&br;　・[[Multi-step liquid phase separation>Liquid phase separation]]
&br;　・[[Macroscopically phase separated melt-spun ribbon]]
&br;　・[[Macroscopically phase separated wire]]
-[[Amorphous wire and rapidly solidified alloy wire]]
&br;　・[[Amorphous wire>Amorphous wire and rapidly solidified alloy wire]]
&br;　・[[Macroscopically phase separated wire]]
&br;　・[[Ti-based wire for for biomedical application]]
-[[Solidification microstructure in Fe-Si based alloys for thermoelectronic materials]]~
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**(3) Material modification by fast electron irradiation - electron knock-on [#c8c147d8]
#ref(http://t-nagase.sakura.ne.jp/EN/pict-new/KenkyuEN-03-IR-HVEM.PNG,left,around,nowrap,photo);
-[[High Voltage Electron Microscopy]]
&br;　・[[Cross section for atomic displacement]]
-[[Solid state amorphization (electron irradiation)>Solid state amorphization]]
&br;　・[[Database>Database, Solid state amorphization]]
&br;　・[[Crystal-to-Amorphous-to-Crystal (C-A-C) transition]]
&br;　・[[Relationship between SSA and Martensite transformation]]
-[[Crystallization (electron irradiation)>Crystallization]] update 2014/09/01
&br;　・[[Database>Database, Crystallization]]
&br;　・[[Crystal-to-Amorphous-to-Crystal (C-A-C) transition]]
&br;　・[[Defects in an amorphous phase - Free volume like defects and Anti Free like defects]]
--[[Pinpoint nanocrystallization of an amorphous phase]]
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**(4) Material modification by electron irradiation - electronic excitation [#e9e6bb38]
#ref(http://t-nagase.sakura.ne.jp/EN/pict-new/KenkyuEN-04-IR-TEM.PNG,left,around,nowrap,photo);
-[[Material modification by electron irradiation - electronic excitation]]
&br;　・[[Synthesis of silicides at metal/SiOx interface]]
&br;　・[[Formation of metallic amorphous at metal/SiOx interface]]
&br;　・[[Crystallization of metallic amorphous at metal/SiOx interface]]
#clear


**(5) Fe-Si based alloys for thermoelectronic materials [#p2b4ce76]
#ref(http://t-nagase.sakura.ne.jp/EN/pict-new/KenkyuEN-05-Thermo.PNG,left,around,nowrap,photo);
-[[Fe-Si based alloys for thermoelectronic materials]]
&br;　・[[Beta-FeSi2 phase formation through phase transition]]
&br;　・[[Solidification microstructure in Fe-Si based alloys for thermoelectronic materials]]
#clear