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杨鑫,康新婷.SPS制备TiAl基合金微观组织演变研究[J].稀有金属材料与工程(英文),2019,48(9):2994~3000.[Yang Xin and kang xinting.Indentification of microstructural evolution mechanisms of TiAl based alloy prepared by spark plasma sintering[J].Rare Metal Materials and Engineering,2019,48(9):2994~3000.]
Indentification of microstructural evolution mechanisms of TiAl based alloy prepared by spark plasma sintering
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Received:March 28, 2017  Revised:April 01, 2019
Key words: Intermetallics  Titanium aluminides  SPS  Microstructural identification mechanisms  Precipitation
Foundation item:国家自然科学基金资助(项目号:51504191,51671152);陕西省自然科学研究计划资助(项目号:2014JM6229),陕西省教育厅自然科学专项资助(项目号:14JK1512);西安市科技局科研项目资助(项目号:CXY1438(5));中央高校基本科研业务费专项资金项目(310832161002);粉末冶金国家重点实验室项目资助
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Yang Xin and kang xinting  
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      This work aims at identifying, by coupled X-Ray diffraction, scanning and transmission electron microscopy (XRD, SEM and TEM) observations, the microstructural evolution mechanisms occuring when an atomized Ti-47Al-2Cr-2Nb-0.2W powder is densified by spark plasma sintering (SPS). For this purpose, interruptions of the SPS cycle have been performed to follow the evolution of the microstricture step by step. During heating-up, the microstructure undergoes successive transformations. At begaining temperature of 1100℃ the α phase transforms into γ and residual B2. The γ phase formed is supersaturated in W. At temperature above 1200℃, TEM observations show that the repartition of the plastic dedormation is correlated to the dendritic microstructure, and the deformation induced α2 →γ phase transformation and the twins.