TY - JOUR
T1 - Solidification Behavior and Microstructures Characteristics of Ti-48Al-3Nb-1.5Ta Powder Produced by Supreme-Speed Plasma Rotating Electrode Process
AU - Zuo, Zhenbo
AU - Hu, Rui
AU - Luo, Xian
AU - Wang, Qingxiang
AU - Li, Chenxi
AU - Zhu, Zhen
AU - Lan, Jian
AU - Liang, Shujin
AU - Tang, Hongkui
AU - Zhang, Kang
N1 - Publisher Copyright:
© 2023, The Chinese Society for Metals (CSM) and Springer-Verlag GmbH Germany, part of Springer Nature.
PY - 2023/8
Y1 - 2023/8
N2 - 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 investigated. The microstructure, phase and characteristics were analyzed by scanning electron microscopy, X-ray diffraction and other methods. The atomization mechanism is direct drop formation. The relationship between the particle size and cooling rate is vc=3.14×10-7·d-2+1.18×10-2·d-32, and the relationship between secondary dendrite arm space and the particle size is λ= 0.028 d+ 0.11 , as well as the relationship between SDAS and cooling rate is λ= 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 better. The carbides mainly exist within 5 nm of the surface and the oxidation layer is about 20 nm thick. Ti-48Al-3Nb-1.5Ta powder was mainly composed of α2 phase and γ phase. With increase in particle size, the content of γ phase increases, and the hardness decreases accordingly. The 106–250 μm particles are composed of multiple grains with the grain size of 70–80 μm. The microstructure, phase composition and hardness of different TiAl powders with the same size are similar, but the elastic modulus is different.
AB - 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 investigated. The microstructure, phase and characteristics were analyzed by scanning electron microscopy, X-ray diffraction and other methods. The atomization mechanism is direct drop formation. The relationship between the particle size and cooling rate is vc=3.14×10-7·d-2+1.18×10-2·d-32, and the relationship between secondary dendrite arm space and the particle size is λ= 0.028 d+ 0.11 , as well as the relationship between SDAS and cooling rate is λ= 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 better. The carbides mainly exist within 5 nm of the surface and the oxidation layer is about 20 nm thick. Ti-48Al-3Nb-1.5Ta powder was mainly composed of α2 phase and γ phase. With increase in particle size, the content of γ phase increases, and the hardness decreases accordingly. The 106–250 μm particles are composed of multiple grains with the grain size of 70–80 μm. The microstructure, phase composition and hardness of different TiAl powders with the same size are similar, but the elastic modulus is different.
KW - Atomization
KW - Microstructure
KW - Powder
KW - Supreme-speed plasma rotating electrode process (SS-PREP®)
KW - TiAl alloy
UR - http://www.scopus.com/inward/record.url?scp=85150707979&partnerID=8YFLogxK
U2 - 10.1007/s40195-023-01539-2
DO - 10.1007/s40195-023-01539-2
M3 - 文章
AN - SCOPUS:85150707979
SN - 1006-7191
VL - 36
SP - 1221
EP - 1234
JO - Acta Metallurgica Sinica (English Letters)
JF - Acta Metallurgica Sinica (English Letters)
IS - 8
ER -