Research topics の履歴ソース(No.23)

#author("2020-04-01T10:50:43+09:00","","")
*Research topics [#a8ce471e]
&size(18){%%%Development of new materials based on the concept "Phase Stability Control"%%%};
#ref(http://t-nagase.sakura.ne.jp/EN/pict-new/KenkyuEN-00-02.PNG,left,around,nowrap,photo);
There are many states including equilibrium and metastable states which are fromed from non-equilibrium (high-energy states, excited states).~
Various materials can be obtained by the microstructure control based on "Phase Stability Control".~
The important targets are summarized by the following two points;~
(1) How to achieve the non-equilibrium state?~
(2) How to control to change from non-equilibrium to equilibrium/metastable states?~
To achieve the development of new materials based on "Phase Stability Control", the followings three techniques are investigated;~
(1) Alloy design: Thermodynamic calculation, ab-initio calculation, Data base science.~
(2) Microstructure analysis: Electron microscopy, In-situ observation, trans-scale observation~
(3) Microstructure control: Solidification and casting, Electron Irradiation~
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~
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&size(18){%%%Materials Science and Engineering for ""Regional Revitalization""%%%};
#ref(http://t-nagase.sakura.ne.jp/pict-new/Kenkyu-11.png,left,around,nowrap,photo);
「地域の得意分野を活かす・既存汎用装置を用いる」~
に基づいて開発された材料は~
(1) 既存汎用装置を使えばすぐに地域で応用展開できる~
(2) その地で培われたノウハウを使えば差別化できる~
の特徴を持つ。~
少子高齢化という避けられない壁にぶつかる中、~
日本における研究リソースはますます厳しくなる。~
(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。~
この概念に基づく材料開発は、~
少子高齢化や人口減少などの社会問題や経済問題に直面する地域に夢と希望を与え、~
「未来を拓く科学技術の創造」と「社会の持続的発展」を~
ともに実現する新たな材料開発の一例であるとも言える。~
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~
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**(1) High Entropy Alloys [#s0fa6ad7]
#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]]
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**(2) Casting and solidification [#m2304ca7]
#ref(http://t-nagase.sakura.ne.jp/EN/pict-new/KenkyuEN-02-Solidification.PNG,left,around,nowrap,photo);
-''[[Solidification microstructure in Cast Iron]]''~
-''[[Solidification microstructure in High Entropy Alloys]]''~
-''[[Solidification microstructure in Ti alloys]]''~
-''[[Solidification microstructure in Fe-Si based alloys for thermoelectronic materials]]''~
-''[[In-situ TEM observation of the dendrite nucleation and growth]]''~
-''[[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]]
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**(3) Material modification by fast electron irradiation - electron knock-on [#a12008ed]
#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 [#bd9a75d5]
#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]]
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**(5) Fe-Si based alloys for thermoelectronic materials [#d54970a1]
#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