Direct observation of dislocation dissociation and Suzuki segregation in a Mg-Zn-Y alloy by aberration-corrected scanning transmission electron microscopy

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	Direct observation of dislocation dissociation and Suzuki segregation in a Mg-Zn-Y alloy by aberration-corrected scanning transmission electron microscopy
	Z. Q. Yang; M. F. Chisholm; G. Duscher; X. L. Ma; S. J. Pennycook
	2013
发表期刊	Acta Materialia
ISSN	1359-6454
卷号	61 期号:1 页码:350-359
摘要	Crystal defects in a plastically deformed Mg-Zn-Y alloy have been studied on the atomic scale using aberration-corrected scanning transmission electron microscopy, providing important structural data for understanding the material's deformation behavior and strengthening mechanisms. Atomic scale structures of deformation stacking faults resulting from dissociation of different types of dislocations have been characterized experimentally, and modeled. Suzuki segregation of Zn and Y along stacking faults formed through dislocation dissociation during plastic deformation at 300 degrees C is confirmed experimentally on the atomic level. The stacking fault energy of the Mg-Zn-Y alloy is evaluated to be in the range of 4.0-10.3 mJ m(-2). The newly formed nanometer-wide stacking faults with their Zn/Y segregation in Mg grains play an important role in the superior strength of this alloy at elevated temperatures. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
部门归属	[yang, zhiqing ; ma, xiuliang] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [yang, zhiqing ; chisholm, matthew f. ; duscher, gerd ; pennycook, stephen j.] oak ridge natl lab, div mat sci & technol, oak ridge, tn 37831 usa. [yang, zhiqing ; duscher, gerd ; pennycook, stephen j.] univ tennessee, dept mat sci & engn, knoxville, tn 37996 usa. ; yang, zq (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. ; yangzq34@yahoo.com
关键词	Dislocation Stacking Fault Suzuki Segregation Strength Mg Alloy Stacking-fault Energies Magnesium Deformation 1st-principles Temperature Superalloy Strength Metals Phase
URL	查看原文
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/71645
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Z. Q. Yang,M. F. Chisholm,G. Duscher,et al. Direct observation of dislocation dissociation and Suzuki segregation in a Mg-Zn-Y alloy by aberration-corrected scanning transmission electron microscopy[J]. Acta Materialia,2013,61(1):350-359.
APA	Z. Q. Yang,M. F. Chisholm,G. Duscher,X. L. Ma,&S. J. Pennycook.(2013).Direct observation of dislocation dissociation and Suzuki segregation in a Mg-Zn-Y alloy by aberration-corrected scanning transmission electron microscopy.Acta Materialia,61(1),350-359.
MLA	Z. Q. Yang,et al."Direct observation of dislocation dissociation and Suzuki segregation in a Mg-Zn-Y alloy by aberration-corrected scanning transmission electron microscopy".Acta Materialia 61.1(2013):350-359.