Effect of microgravity on the solidification of aluminum-bismuth-tin immiscible alloys

doi:10.1038/s41526-019-0086-z

IMR OpenIR

	Effect of microgravity on the solidification of aluminum-bismuth-tin immiscible alloys
	Jiang, Hongxiang 1; Li, Shixin 1,2; Zhang, Lili 1; He, Jie 1; Zhao, Jiuzhou 1
通讯作者	Jiang, Hongxiang(hxjiang@imr.ac.cn) ; Zhao, Jiuzhou(jzzhao@imr.ac.cn)
	2019-11-18
发表期刊	NPJ MICROGRAVITY
卷号	5 页码:9
摘要	Directional solidification experiment was carried out with Al-Bi-Sn immiscible alloy under microgravity environment onboard the Tiangong 2 space laboratory of China. Sample with a well-dispersed microstructure was obtained by properly designing the experimental scheme, the matrix shows equiaxed morphology, and there is no visible gas cavity or pinhole in the sample. In contrast, the reference samples solidified on earth show phase-segregated structure and contain some gas cavities or pinholes. The grain morphology of the terrestrial sample depends on the solidification direction, it is equiaxed when the sample ampoule was withdrawn against the gravity direction, while it is columnar when the sample ampoule was withdrawn along the gravity direction. The solidification process and affecting mechanisms of microgravity on the microstructure formation are discussed. The results indicate that the microgravity conditions can effectively diminish the convective flow of the melt and the Stokes motions of the minority phase droplets and gas bubbles, which are helpful for suppressing the occurrence of macro-segregation and preventing the formation of porosity. The results also demonstrate that the microgravity conditions favor the detachment between the melt and the wall of crucible, thus increasing the nucleation undercooling of alpha-Al nuclei and promoting the formation of equiaxed grain.
资助者	China's Manned Space Station Project ; Chinese Academy of Sciences Strategic Priority Program on Space Science ; National Natural Science Foundation of China
DOI	10.1038/s41526-019-0086-z
收录类别	SCI
语种	英语
资助项目	China's Manned Space Station Project[TGJZ800-2-RW024] ; Chinese Academy of Sciences Strategic Priority Program on Space Science[XDA15013800] ; National Natural Science Foundation of China[51771210] ; National Natural Science Foundation of China[51574216] ; National Natural Science Foundation of China[51774264]
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:000496834200001
出版者	NATURE PUBLISHING GROUP
引用统计	被引频次：9[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/136932
专题	中国科学院金属研究所
通讯作者	Jiang, Hongxiang; Zhao, Jiuzhou
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Liaoning, Peoples R China
推荐引用方式 GB/T 7714	Jiang, Hongxiang,Li, Shixin,Zhang, Lili,et al. Effect of microgravity on the solidification of aluminum-bismuth-tin immiscible alloys[J]. NPJ MICROGRAVITY,2019,5:9.
APA	Jiang, Hongxiang,Li, Shixin,Zhang, Lili,He, Jie,&Zhao, Jiuzhou.(2019).Effect of microgravity on the solidification of aluminum-bismuth-tin immiscible alloys.NPJ MICROGRAVITY,5,9.
MLA	Jiang, Hongxiang,et al."Effect of microgravity on the solidification of aluminum-bismuth-tin immiscible alloys".NPJ MICROGRAVITY 5(2019):9.