Phase-field simulation of twin boundary fractions in fully lamellar TiAl alloys

IMR OpenIR

	Phase-field simulation of twin boundary fractions in fully lamellar TiAl alloys
	C. Y. Teng; N. Zhou; Y. Wang; D. S. Xu; A. Du; Y. H. Wen; R. Yang
	2012
发表期刊	Acta Materialia
ISSN	1359-6454
卷号	60 期号:18 页码:6372-6381
摘要	The phenomenon of high twin boundary fractions found experimentally for neighboring gamma lamellae in fully lamellar TiAl alloys was investigated by phase-field simulations. The nucleation and growth processes during alpha(2)' -> alpha(2) + gamma transformation that leads to the lamellar structure were simulated. In particular, the effects of coherency stress and the interfacial energy difference among different types of interfaces and undercooling on the nucleation mechanism were analyzed. It is found that the twin boundary fraction increases with increasing coherency elastic strain energy and increasing interfacial energy difference among different types of interfaces, and with decreasing undercooling. Depending on the relative contributions of these factors, the nucleation events simulated by the Langevin noises could be collective, correlated or independent. These findings could shed light on the control of twin boundary fraction within lamellar structures by adjusting alloy composition and cooling route. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
部门归属	[teng, c. y.; zhou, n.; wang, y.] ohio state univ, dept mat sci & engn, columbus, oh 43210 usa. [teng, c. y.; du, a.] northeastern univ, coll sci, shenyang 110004, peoples r china. [teng, c. y.; xu, d. s.; yang, r.] chinese acad sci, inst met res, shenyang 110016, peoples r china. [wen, y. h.] natl energy technol lab, albany, or 97321 usa.;wang, y (reprint author), ohio state univ, dept mat sci & engn, 2041 coll rd, columbus, oh 43210 usa.;wang.363@osu.edu; dsxu@imr.ac.cn
关键词	Nucleation Of Phase Transformations Elastic Behavior Titanium Aluminides Precipitation Phase-field Models Resolution Electron-microscopy Gamma-titanium Aluminides Computer-simulation Microstructural Development Gamma-alpha(2) Interfaces Intermetallic Alloys Deformation Twins Slip Transfer Al Alloys Nucleation
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/60263
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	C. Y. Teng,N. Zhou,Y. Wang,et al. Phase-field simulation of twin boundary fractions in fully lamellar TiAl alloys[J]. Acta Materialia,2012,60(18):6372-6381.
APA	C. Y. Teng.,N. Zhou.,Y. Wang.,D. S. Xu.,A. Du.,...&R. Yang.(2012).Phase-field simulation of twin boundary fractions in fully lamellar TiAl alloys.Acta Materialia,60(18),6372-6381.
MLA	C. Y. Teng,et al."Phase-field simulation of twin boundary fractions in fully lamellar TiAl alloys".Acta Materialia 60.18(2012):6372-6381.