#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~ #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]]~ -[[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]] #clear **(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]] #clear **(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