Research topics の履歴差分(No.21)

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#author("2019-11-13T08:47:26+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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**(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]]
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**(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]]~
-[[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]]~
-[[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]]
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**(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]]
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