Mechanism of competitive growth during directional solidification of a nickel-base superalloy in a three-dimensional reference frame

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	Mechanism of competitive growth during directional solidification of a nickel-base superalloy in a three-dimensional reference frame
	X. B. Meng; Q. Lu; X. L. Zhang; J. G. Li; Z. Q. Chen; Y. H. Wang; Y. Z. Zhou; T. Jin; X. F. Sun; Z. Q. Hu
	2012
发表期刊	Acta Materialia
ISSN	1359-6454
卷号	60 期号:9 页码:3965-3975
摘要	The microstructure evolution of bicrystal samples during directional solidification was studied, both by simulation and experiment, to explore the mechanism of competitive growth. A new orientation relationship of bicrystal samples, the non-uniplanar case, is proposed, which expands the orientation relationship of bicrystal samples from two dimensions to three dimensions. The results show that, in the non-uniplanar case, the favorably oriented grain overgrows the unfavorably oriented grain by developing new dendrites in the lateral gap where the primary dendrites of the unfavorably oriented grain diverge from the mold wall. During this process, the grain boundary is found to move in two directions, one perpendicular to the grain boundary and the other parallel to the grain boundary. To characterize the state of dendrite growth, a three-dimensional reference frame is constructed. In this reference frame, the mechanism of competitive growth can be categorized as a converging case, a non-uniplanar case and a diverging case. Furthermore, the simulation results are in good agreement with the experimental findings. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
部门归属	[meng, x. b.; lu, q.; zhang, x. l.; li, j. g.; zhou, y. z.; jin, t.; sun, x. f.; hu, z. q.] chinese acad sci, inst met res, shenyang 110016, peoples r china. [lu, q.; zhang, x. l.] chinese acad sci, grad sch, beijing 100049, peoples r china. [chen, z. q.; wang, y. h.] shenyang liming aeroengine grp corp ltd, aviat ind corp china avic, shenyang 110043, peoples r china.;meng, xb (reprint author), chinese acad sci, inst met res, shenyang 110016, peoples r china.;xbmeng@imr.ac.cn; jgli@imr.ac.cn
关键词	Directional Solidification Competitive Growth Non-uniplanar Case 3-d Reference Frame Rotation Single-crystal Superalloys Low-angle Boundaries Seed Melt-back Grain Structures Prediction Orientation Castings Model
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/60161
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. B. Meng,Q. Lu,X. L. Zhang,et al. Mechanism of competitive growth during directional solidification of a nickel-base superalloy in a three-dimensional reference frame[J]. Acta Materialia,2012,60(9):3965-3975.
APA	X. B. Meng.,Q. Lu.,X. L. Zhang.,J. G. Li.,Z. Q. Chen.,...&Z. Q. Hu.(2012).Mechanism of competitive growth during directional solidification of a nickel-base superalloy in a three-dimensional reference frame.Acta Materialia,60(9),3965-3975.
MLA	X. B. Meng,et al."Mechanism of competitive growth during directional solidification of a nickel-base superalloy in a three-dimensional reference frame".Acta Materialia 60.9(2012):3965-3975.