Formation of TiAlSi intermetallics during heating Ti-A356 Al mixed powder compact at semisolid temperature

doi:10.1016/j.jmst.2021.04.018

	Formation of TiAlSi intermetallics during heating Ti-A356 Al mixed powder compact at semisolid temperature
	Gao, M.; Chen, T.J.; Zhang, Z.X.
刊名	Journal of Materials Science and Technology
	2021-12-20
卷号	94 页码:247-263
关键词	Aluminum Crystal structure Morphology Oxide films Plates (structural components) Powder metals Silicon Titanium alloys Titanium oxides Anisotropic growth Combined effect Formation process In compositions Internal energies Metal materials Ternary intermetallics Tialsi intermetallics
ISSN号	10050302
DOI	10.1016/j.jmst.2021.04.018
英文摘要	Due to the similarity in composition and crystal structure of some TiAlSi ternary intermetallics, it is quite difficult to accurately confirm their physic characteristics, and thus, to tailor microstructure to improve mechanical properties of metal materials related to the TiAlSi intermetallics. Therefore, the formation process of TiAlSi intermetallics was investigated during heating Ti-A356 mixed powder compact at a A356 alloy semisolid temperature of 595 °C. The results indicated that two kinds of intermetallics of τ1 (tetragonal, I41/amd) and τ2 (orthorhombic, Cmcm) generated, and both the concentration and supply direction of Ti atoms, which are related to local breakage of oxide films on neighboring Ti and A356 alloy powders, determined the phase and morphology of the intermetallics. τ1 and τ2 crystals all had an intrinsic plate morphology, but τ2 crystals were thinner due to more anisotropic growth resulted from their high density of stacking faults (SFs). τ1 lamellar domains generated during growth of τ2 crystals, which were accompanied by decrease in density of SFs. The combined effect of size difference and internal energy difference between τ1 and τ2 crystals made large τ1 crystals coarsen at the expense of τ2 crystals in Ostwald ripening, leading them to finally evolve into an agglomerate of large τ1 plates. © 2021
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	Chinese Society of Metals
WOS记录号	WOS:000733964800004
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/150730]
专题	材料科学与工程学院校医院
作者单位	State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou; 730050, China
推荐引用方式 GB/T 7714	Gao, M.,Chen, T.J.,Zhang, Z.X.. Formation of TiAlSi intermetallics during heating Ti-A356 Al mixed powder compact at semisolid temperature[J]. Journal of Materials Science and Technology,2021,94:247-263.
APA	Gao, M.,Chen, T.J.,&Zhang, Z.X..(2021).Formation of TiAlSi intermetallics during heating Ti-A356 Al mixed powder compact at semisolid temperature.Journal of Materials Science and Technology,94,247-263.
MLA	Gao, M.,et al."Formation of TiAlSi intermetallics during heating Ti-A356 Al mixed powder compact at semisolid temperature".Journal of Materials Science and Technology 94(2021):247-263.