Anomalous effects of strain rate on the room-temperature ductility of a cast Mg-Gd-Y-Zr alloy

doi:10.1016/j.actamat.2018.08.013

IMR OpenIR

	Anomalous effects of strain rate on the room-temperature ductility of a cast Mg-Gd-Y-Zr alloy
	Li, J. L.1,2; Wu, D.1; Chen, R. S.1; Han, E. H.1
通讯作者	Wu, D.(dwu@imr.ac.cn) ; Chen, R. S.(rschen@imr.ac.cn)
	2018-10-15
发表期刊	ACTA MATERIALIA
ISSN	1359-6454
卷号	159 页码:31-45
摘要	The loading rate significantly affects the mechanical properties of Mg alloys. However, the effects of strain rate on newly developed Mg-Gd-Y alloys at room temperature (RT) have rarely been investigated. Here, uniaxial tensile tests were conducted on a cast Mg-10Gd-3Y-0.52r (wt. %) alloy (GW103) in both as-aged and as-solutionized states with different grains sizes at RT and various strain rates. The results showed an anomalous positive strain-rate dependence of elongation in all the GW103 alloys investigated from 1 x 10(-5) to 1 x 10(-1) s(-1). Careful microstructural characterization by slip trace analysis revealed that the exclusive deformation mechanism of pyramidal slip, non-Schmid behavior of basal slip, and slip transfer at 1 x 10(-1) s(-1); these induced the high RT ductility. The occurrence of pyramidal slip activity at high strain rates was suggested to be associated with rare earth solutes, fine precipitates, and local high stresses at grain boundaries due to dislocation pile-up. It was proposed that the increasing strain rate was approximately equivalent to decreases in grain size, enabling the generation of local stresses at grain boundaries, thus causing this anomalous phenomenon. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
关键词	Mg-Gd-Y alloy Strain rate Room-temperature ductility Slip traces analysis
资助者	National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Science and Technology Major Project of China ; National Basic Research Program of China (973 Program)
DOI	10.1016/j.actamat.2018.08.013
收录类别	SCI
语种	英语
资助项目	National Key Research and Development Program of China[2016YFB0301104] ; National Natural Science Foundation of China[51531002] ; National Natural Science Foundation of China[51301173] ; National Natural Science Foundation of China[51601193] ; National Natural Science Foundation of China[51701218] ; National Science and Technology Major Project of China[2017ZX04014001] ; National Basic Research Program of China (973 Program)[2013CB632202]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000445986300004
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：77[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/321006/129563
专题	中国科学院金属研究所
通讯作者	Wu, D.; Chen, R. S.
作者单位	1.Chinese Acad Sci, Inst Met Res, Grp Magnesium Alloys & Their Applicat, 62 Wencui Rd, Shenyang 110016, Liaoning, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, 19 Jinzhai Rd, Hefei 230026, Anhui, Peoples R China
推荐引用方式 GB/T 7714	Li, J. L.,Wu, D.,Chen, R. S.,et al. Anomalous effects of strain rate on the room-temperature ductility of a cast Mg-Gd-Y-Zr alloy[J]. ACTA MATERIALIA,2018,159:31-45.
APA	Li, J. L.,Wu, D.,Chen, R. S.,&Han, E. H..(2018).Anomalous effects of strain rate on the room-temperature ductility of a cast Mg-Gd-Y-Zr alloy.ACTA MATERIALIA,159,31-45.
MLA	Li, J. L.,et al."Anomalous effects of strain rate on the room-temperature ductility of a cast Mg-Gd-Y-Zr alloy".ACTA MATERIALIA 159(2018):31-45.