Hot Tearing of Sand Cast Mg-5 wt.% Y-4 wt.% RE (WE54) Alloy

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	Hot Tearing of Sand Cast Mg-5 wt.% Y-4 wt.% RE (WE54) Alloy
	J. L. Li; R. S. Chen; Y. Q. Ma; W. Ke
	2013
发表期刊	Acta Metallurgica Sinica-English Letters
ISSN	1006-7191
卷号	26 期号:6 页码:728-734
摘要	Hot tearing is a common and severe defect occurring during solidification of castings. The rational understanding of hot tearing formation mechanism is beneficial to the foundry process design. In the present research, a new developed instrumented "CRC" equipment was applied in characterization of hot tearing in sand cast Mg-5 wt.% Y-4 wt.% RE (WE54) alloy with and without Zr addition. Microstructure observation and thermal analysis were carried out to help analyzing the results. The results showed that hot tearing onset occurs at a relatively low solid fraction (f(s)) in WE54 alloy sand castings, which indicates the participation of remaining liquid during hot tearing formation. Microstructure observation of the hot tearing surface also proves the liquid film existence between solidifying dendrites. The contraction strain caused by casting solidification induces the flowing of remaining liquid between solidifying dendrites and results in formation of interdendritic liquid films. These liquid films are separated by sufficient contraction stress and form hot cracks. The addition of Zr in WE54 alloy significantly refines the alloy microstructure and increases the solid fraction at hot tearing onset, both of which result in increasing of the fracture stress of interdendritic liquid film. Thus the hot tearing susceptibility of WE54 alloy is weakened by Zr addition.
部门归属	[li, jilin ; chen, rongshi ; ma, yuequn ; ke, wei] chinese acad sci, inst met res, state key lab corros & protect, shenyang 110016, peoples r china. ; chen, rs (reprint author), chinese acad sci, inst met res, state key lab corros & protect, shenyang 110016, peoples r china. ; rschen@imr.ac.cn
关键词	Mg-5 Wt.% Y-4 Wt.% Re (We54) Magnesium Alloy Sand Cast Hot Tearing Defect Instrumented "crc" Mechanical-properties Aluminum-alloys Magnesium Alloy Si Alloy Susceptibility Solidification Methodology Additions Behavior
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语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/72372
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	J. L. Li,R. S. Chen,Y. Q. Ma,et al. Hot Tearing of Sand Cast Mg-5 wt.% Y-4 wt.% RE (WE54) Alloy[J]. Acta Metallurgica Sinica-English Letters,2013,26(6):728-734.
APA	J. L. Li,R. S. Chen,Y. Q. Ma,&W. Ke.(2013).Hot Tearing of Sand Cast Mg-5 wt.% Y-4 wt.% RE (WE54) Alloy.Acta Metallurgica Sinica-English Letters,26(6),728-734.
MLA	J. L. Li,et al."Hot Tearing of Sand Cast Mg-5 wt.% Y-4 wt.% RE (WE54) Alloy".Acta Metallurgica Sinica-English Letters 26.6(2013):728-734.