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

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	Anomalous effects of strain rate on the room-temperature ductility of a cast Mg-Gd-Y-Zr alloy
	Li, JL ; Wu, D ; Chen, RS ; Han, EH
刊名	ACTA MATERIALIA
	2018-10-15
卷号	159 页码:31-45
关键词	Mg-Gd-Y alloy Strain rate Room-temperature ductility Slip traces analysis
ISSN号	1359-6454
DOI	10.1016/j.actamat.2018.08.013
英文摘要	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.
学科主题	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
语种	英语
WOS记录号	WOS:000445986300004
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79897]
专题	金属研究所_中国科学院金属研究所
作者单位	1.[Li, J. L. 2.Wu, D. 3.Chen, R. S. 4.Han, E. H.] Chinese Acad Sci, Inst Met Res, Grp Magnesium Alloys & Their Applicat, 62 Wencui Rd, Shenyang 110016, Liaoning, Peoples R China 5.[Li, J. L.] 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, JL,Wu, D,Chen, RS,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, JL,Wu, D,Chen, RS,&Han, EH.(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, JL,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.