Sudden transition from columnar to equiaxed grain of cast copper induced by rare earth microalloying

IMR OpenIR

	Sudden transition from columnar to equiaxed grain of cast copper induced by rare earth microalloying
	Chen, Yan; Zhang, Shihong; Song, Hongwu; Cheng, Ming; Li, Haihong; Liu, Jinsong; shzhang@imr.ac.cn
	2016
发表期刊	MATERIALS & DESIGN
ISSN	0261-3069
卷号	91 页码:314-320
摘要	A sudden columnar-to-equiaxed transition (CET) of cast copper with rare earth (RE) microalloying has been examined. Some solidification parameters of Cu-La alloys were determined by using optical microscopy and differential scanning calorimetry, and simulation of temperature field in copper ingot solidification process. It is noted that the addition of RE microalloying can purify the alloy and make an interaction between equiaxed nucleation and constitutional undercooling, which results in a sudden CET. Furthermore, a new prediction model of the critical alloy composition condition for the CET induced by RE microalloying is established. The critical compositions of a sudden CET of cast copper with La addition is 0.14 wt.%, which is in good agreement with the experimental results. It is suggested that increasing the alloy content is very necessary at a high gradient in order to promote the CET. However, the number N-0 of effective nucleation sites should also be increased with the decrease of the alloy composition. Meanwhile, it can be found that the columnar region can be expanded with the increase of the temperature gradient. It is obvious that lowering temperature gradient contributes to promote the CET. The prediction model can also be used in the common CET very well. (C) 2015 Elsevier Ltd. All rights reserved.
部门归属	[chen, yan ; zhang, shihong ; song, hongwu ; cheng, ming ; li, haihong ; liu, jinsong] chinese acad sci, inst met res, shenyang 110016, peoples r china
关键词	Sudden Columnar-to-equiaxed Transition Rare Earth Microalloying Cast Copper Constitutional Undercooling
资助者	Science Foundation of The Chinese Academy of Sciences [2012005]
收录类别	sci
语种	英语
WOS记录号	WOS:000367235400037
引用统计	被引频次：18[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/321006/75148
专题	中国科学院金属研究所
通讯作者	shzhang@imr.ac.cn
推荐引用方式 GB/T 7714	Chen, Yan,Zhang, Shihong,Song, Hongwu,et al. Sudden transition from columnar to equiaxed grain of cast copper induced by rare earth microalloying[J]. MATERIALS & DESIGN,2016,91:314-320.
APA	Chen, Yan.,Zhang, Shihong.,Song, Hongwu.,Cheng, Ming.,Li, Haihong.,...&shzhang@imr.ac.cn.(2016).Sudden transition from columnar to equiaxed grain of cast copper induced by rare earth microalloying.MATERIALS & DESIGN,91,314-320.
MLA	Chen, Yan,et al."Sudden transition from columnar to equiaxed grain of cast copper induced by rare earth microalloying".MATERIALS & DESIGN 91(2016):314-320.