Reasonable utilization of {10-12} twin for optimizing microstructure and improving mechanical property in a Mg-Gd-Y alloy

doi:10.1016/j.matdes.2020.108600

CORC > 金属研究所 > 中国科学院金属研究所

	Reasonable utilization of {10-12} twin for optimizing microstructure and improving mechanical property in a Mg-Gd-Y alloy
	Lu, S. H.1,2; Wu, D.1; Chen, R. S.1; Han, En-Hou 1
刊名	MATERIALS & DESIGN
	2020-06-01
卷号	191 页码:21
关键词	Mg alloy Forging Twin DRX Texture
ISSN号	0264-1275
DOI	10.1016/j.matdes.2020.108600
通讯作者	Wu, D.(dwu@imr.ac.cn) ; Chen, R. S.(rschen@imr.ac.cn)
英文摘要	During the deformation of Mg alloys, {10-12} extension twin, as one of the most active deformation mechanisms, contributed much to the formation of basal texture, yet little to dynamic recrystallization (DRX) grains, i.e., effective grain refinement. In this work, {10-12} extension twin had been creatively utilized to achieve grain refinement and property improvement in a Mg-Gd-Y alloy by multi-directional impact forging (MDIF). Firstly, flourishing {10-12} extension twins divided the parent grain into many fine independent regions (similar to 10 mu m). Meanwhile, a large number of twin boundaries were pinning mainly by interaction with neighboring dislocations in twin or matrix. Secondly, those pinned twin boundaries can effectively accumulate dislocation slips and promote the formation of extensive low angle grain boundaries (LAGBs). These high densities of LAGBs can further subdivide the independent regions provided by extension twins into micro-regions (similar to 5 mu m). Thirdly, those fine micro-regions developed to be DRX after a dynamic recovery. Finally, we obtained a yield isotropy high-strength Mg alloy with an ultimate tensile strength of 354 MPa after MDIF of 110 passes. This work proposed a brand new insight to prepare wrought Mg alloy with fine grain, yet without strong texture, which is beneficial to better formability and mechanical property isotropy. (C) 2020 The Authors. Published by Elsevier Ltd.
资助项目	National Key Research and Development Program of China[2016YFB0301104] ; National Natural Science Foundation of China (NSFC)[51531002] ; National Natural Science Foundation of China (NSFC)[51301173] ; National Natural Science Foundation of China (NSFC)[51601193] ; National Natural Science Foundation of China (NSFC)[51701218] ; National Science and Technology Major Project of China[2017ZX04014001] ; Natural Science Foundation of Liaoning province[20180550799]
WOS研究方向	Materials Science
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000536937200022
资助机构	National Key Research and Development Program of China ; National Natural Science Foundation of China (NSFC) ; National Science and Technology Major Project of China ; Natural Science Foundation of Liaoning province
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/139164]
专题	金属研究所_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, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, 72 Wenhua Rd, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Lu, S. H.,Wu, D.,Chen, R. S.,et al. Reasonable utilization of {10-12} twin for optimizing microstructure and improving mechanical property in a Mg-Gd-Y alloy[J]. MATERIALS & DESIGN,2020,191:21.
APA	Lu, S. H.,Wu, D.,Chen, R. S.,&Han, En-Hou.(2020).Reasonable utilization of {10-12} twin for optimizing microstructure and improving mechanical property in a Mg-Gd-Y alloy.MATERIALS & DESIGN,191,21.
MLA	Lu, S. H.,et al."Reasonable utilization of {10-12} twin for optimizing microstructure and improving mechanical property in a Mg-Gd-Y alloy".MATERIALS & DESIGN 191(2020):21.