Solidification Behavior and Microstructures Characteristics of Ti-48Al-3Nb-1.5Ta Powder Produced by Supreme-Speed Plasma Rotating Electrode Process
作者机构：State Key Laboratory of Solidification ProcessingNorthwestern Polytechnical UniversityXi’an710072China Sino-Euro Materials Technologies of Xi’an Co.Ltd.Xi’an710018China
出 版 物：《金属学报:英文版》 (Acta Metallurgica Sinica(English Letters))
年 卷 期：2023年第36卷第8期
页 面：1221-1234页
核心收录：
学科分类：0817[工学-化学工程与技术] 0806[工学-冶金工程] 08[工学] 0807[工学-动力工程及工程热物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0802[工学-机械工程] 0703[理学-化学] 0811[工学-控制科学与工程]
基 金：financially supported by the Key R&D Program of Shaanxi(Program No.2022GY-388)
主 题：Supreme-speed plasma rotating electrode process(SS-PREP) TiAl alloy Atomization Powder Microstructure
摘 要：In this study,the characteristics and solidification behavior of Ti-48Al-3Nb-1.5Ta powder produced by supreme-speed plasma rotating electrode process(SS-PREP®)were *** microstructure,phase and characteristics were analyzed by scanning electron microscopy,X-ray diffraction and other *** atomization mechanism is direct drop *** relationship between the particle size and cooling rate is vc=3.14×10^(-7)·d^(-2)+1.18×10^(-2)·d^(3/2),and the relationship between secondary dendrite arm space and the particle size isλ=0.028d+0.11,as well as the relationship between SDAS and cooling rate isλ=4.84×10^(-5)·T^(-1.43).With increase in particle size,the surface structure gradually changes from the featureless smooth structure to dendritic and cellular dendritic morphology,and the flow ability becomes *** carbides mainly exist within 5 nm of the surface and the oxidation layer is about 20 nm ***-48Al-3Nb-1.5Ta powder was mainly composed ofα2 phase andγ*** increase in particle size,the content ofγphase increases,and the hardness decreases *** 106–250μm particles are composed of multiple grains with the grain size of 70–80μ*** microstructure,phase composition and hardness of different TiAl powders with the same size are similar,but the elastic modulus is different.
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