Notch strength and notch fracture mechanisms of a cast Mg-Gd-Y alloy

doi:10.1016/j.msea.2022.142668

IMR OpenIR

	Notch strength and notch fracture mechanisms of a cast Mg-Gd-Y alloy
	Wei, J. X.1,2; Yan, H.1,3; Chen, R. S.1
通讯作者	Yan, H.(hyan@imr.ac.cn)
	2022-02-17
发表期刊	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN	0921-5093
卷号	835 页码:15
摘要	This study aims to elucidate the mechanical properties and fracture mechanisms of cast Mg-6Gd-3Y-0.4Zr (wt.%) (GW63) alloy in the presence of geometrical discontinuities induced by notches. Notch strength is evaluated by room-temperature tensile tests using circumferentially notched bars of different notch acuity. Finite element calculations suggest that notch fracture is controlled by the von Mises stress and effective plastic strain at the notch tip. Through fractographic observations and EBSD analysis on samples subjected to interrupted tests, a cleavage micro-cracking behavior uncommon for conventional Mg alloys is found to dominate notch fracture. Grain-sized cleavage microcracks tend to occur along the basal plane of grains favorably oriented for basal slip, which is explained by crack nucleation at co-planar slip bands blocked by the grain boundary according to Smith and Barnby's theory. Failure is initiated by the accumulation and coalescence of such microcracks in the notch vicinity. The unexpected cleavage micro-cracking behavior is mainly ascribed to the RE solutes that suppress {10-12} twinning, and is responsible for the limited deformation capacity and notch strength of the cast-T6 GW63 alloy with coarse grains and significant strengthening due to precipitation.
关键词	Magnesium alloy Fracture Notch strength EBSD Finite element analysis
资助者	National Natural Science Foundation of China ; Natural Science Foundation of Liaoning Province ; National Key Research and Development Program of China ; State Key Program of National Natural Science of China
DOI	10.1016/j.msea.2022.142668
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[51601193] ; National Natural Science Foundation of China[51701218] ; Natural Science Foundation of Liaoning Province[2020-MS-004] ; National Key Research and Development Program of China[2016YFB0301104] ; State Key Program of National Natural Science of China[51531002]
WOS研究方向	Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000761774300004
出版者	ELSEVIER SCIENCE SA
引用统计	被引频次：15[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/321006/173187
专题	中国科学院金属研究所
通讯作者	Yan, H.
作者单位	1.Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, 72 Wenhua Rd, Shenyang 110016, Peoples R China 3.Shandong Univ Sci & Technol, Sch Mat Sci & Engn, Qingdao 266590, Shandong, Peoples R China
推荐引用方式 GB/T 7714	Wei, J. X.,Yan, H.,Chen, R. S.. Notch strength and notch fracture mechanisms of a cast Mg-Gd-Y alloy[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2022,835:15.
APA	Wei, J. X.,Yan, H.,&Chen, R. S..(2022).Notch strength and notch fracture mechanisms of a cast Mg-Gd-Y alloy.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,835,15.
MLA	Wei, J. X.,et al."Notch strength and notch fracture mechanisms of a cast Mg-Gd-Y alloy".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 835(2022):15.