Strengthening and toughening mechanisms in Mg-Zn-Y alloy with a long period stacking ordered structure

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	Strengthening and toughening mechanisms in Mg-Zn-Y alloy with a long period stacking ordered structure; Strengthening and toughening mechanisms in Mg-Zn-Y alloy with a long period stacking ordered structure
	X. H. Shao; Z. Q. Yang; X. L. Ma
	2010 ; 2010
发表期刊	Acta Materialia ; Acta Materialia
ISSN	1359-6454 ; 1359-6454
卷号	58 期号:14 页码:4760-4771
摘要	The deformation behavior and corresponding microstructure evolution of a Mg(97)Zn(1)Y(2) (at.%) alloy with a long period stacking ordered (LPSO) structure subjected to hot compression were investigated. The peak stress at 573 K was about 190 MPa, and no macroscopic fracture took place up to a strain of about 60%. The mechanisms responsible for the mechanical performance of the Mg(97)Zn(1)Y(2) (at.%) alloy are discussed based on microstructural investigations using various electron microscopy techniques. The high strength at elevated temperature could be attributed to synergetic strengthening refinement of the LPSO via kinking and a limited fraction of dynamical recrystallization. Microcracks nucleated at the interfaces in the sandwich structure composed of LPSO and nanometer thick Mg slices could weaken the alloy at late stages of deformation, but their propagation could be limited within the individual kink band where the microcracks nucleated, which could ensure the capability of the alloy to resist premature or catastrophic fracture. Furthermore, lack of deformation twins in Mg grains effectively reduced the potential nucleation sites for cracks, which should be another reason for the good ductility of the alloy. These findings may provide or evoke insights into methods for optimizing the mechanical properties of Mg alloys. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.; The deformation behavior and corresponding microstructure evolution of a Mg(97)Zn(1)Y(2) (at.%) alloy with a long period stacking ordered (LPSO) structure subjected to hot compression were investigated. The peak stress at 573 K was about 190 MPa, and no macroscopic fracture took place up to a strain of about 60%. The mechanisms responsible for the mechanical performance of the Mg(97)Zn(1)Y(2) (at.%) alloy are discussed based on microstructural investigations using various electron microscopy techniques. The high strength at elevated temperature could be attributed to synergetic strengthening refinement of the LPSO via kinking and a limited fraction of dynamical recrystallization. Microcracks nucleated at the interfaces in the sandwich structure composed of LPSO and nanometer thick Mg slices could weaken the alloy at late stages of deformation, but their propagation could be limited within the individual kink band where the microcracks nucleated, which could ensure the capability of the alloy to resist premature or catastrophic fracture. Furthermore, lack of deformation twins in Mg grains effectively reduced the potential nucleation sites for cracks, which should be another reason for the good ductility of the alloy. These findings may provide or evoke insights into methods for optimizing the mechanical properties of Mg alloys. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
部门归属	[shao, x. h.; yang, z. q.; ma, x. l.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [shao, x. h.] chinese acad sci, grad sch, beijing 100049, peoples r china.;yang, zq (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china;yangzq@imr.ac.cn xlma@imr.ac.cn ; [shao, x. h.; yang, z. q.; ma, x. l.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [shao, x. h.] chinese acad sci, grad sch, beijing 100049, peoples r china.;yang, zq (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china;yangzq@imr.ac.cn xlma@imr.ac.cn
关键词	Mg-zn-y Alloy Mg-zn-y Alloy Long Period Stacking Ordered Structure Long Period Stacking Ordered Structure Kinking Kinking Strengthening Strengthening Toughening Toughening Solidified Mg97zn1y2 Alloy Solidified Mg97zn1y2 Alloy Deformation-behavior Deformation-behavior Magnesium Alloy Magnesium Alloy Dynamic Recrystallization Dynamic Recrystallization Elevated-temperatures Elevated-temperatures Contraction Twins Contraction Twins Room-temperature Room-temperature Mg97y2zn1 Alloy Mg97y2zn1 Alloy Phase Phase Microstructure Microstructure
URL	查看原文 ; 查看原文
WOS记录号	WOS:000279845400017 ; WOS:000279845400017
引用统计	被引频次：583[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/321006/31428
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. H. Shao,Z. Q. Yang,X. L. Ma. Strengthening and toughening mechanisms in Mg-Zn-Y alloy with a long period stacking ordered structure, Strengthening and toughening mechanisms in Mg-Zn-Y alloy with a long period stacking ordered structure[J]. Acta Materialia, Acta Materialia,2010, 2010,58, 58(14):4760-4771, 4760-4771.
APA	X. H. Shao,Z. Q. Yang,&X. L. Ma.(2010).Strengthening and toughening mechanisms in Mg-Zn-Y alloy with a long period stacking ordered structure.Acta Materialia,58(14),4760-4771.
MLA	X. H. Shao,et al."Strengthening and toughening mechanisms in Mg-Zn-Y alloy with a long period stacking ordered structure".Acta Materialia 58.14(2010):4760-4771.