Mechanistic investigation of a low-alloy Mg-Ca-based extrusion alloy with high strength-ductility synergy

doi:10.1016/j.actamat.2020.01.017

CORC > 金属研究所 > 中国科学院金属研究所

	Mechanistic investigation of a low-alloy Mg-Ca-based extrusion alloy with high strength-ductility synergy
	Pan, Hucheng 2; Kang, Rui 2; Li, Jingren 2; Xie, Hongbo 3; Zeng, Zhuoran 4; Huang, Qiuyan 1; Yang, Changlin 5; Ren, Yuping 2; Qin, Gaowu 3
刊名	ACTA MATERIALIA
	2020-03-01
卷号	186 页码:278-290
关键词	Mg wrought alloy Mechanical property Low-angle grain boundary Dynamic recrystallisation Pyramidal dislocations
ISSN号	1359-6454
DOI	10.1016/j.actamat.2020.01.017
通讯作者	Zeng, Zhuoran(zhuoran.zeng@monash.edu) ; Huang, Qiuyan(gyhuang16b@imr.ac.cn) ; Qin, Gaowu(qingw@smm.neu.edu.cn)
英文摘要	High strength-ductility synergy is difficult to achieve in Mg alloys. Although high strength has been achieved through considerable alloying addition and low-temperature extrusion, these techniques result in low ductility (2%-5%). In this work, a novel low-alloy Mg-Ca-based alloy that overcomes this strength-ductility trade-off is designed. The alloy has an excellent tensile yield strength (similar to 425 MPa) and exhibits a reasonably high elongation capacity (similar to 11%). A microstructure examination reveals that a high density of submicron grains and nano-precipitates provides the alloy high strength, and the leaner alloy additions and higher extrusion temperatures initially improve ductility. As a result, the density of residual dislocations is reduced, and the formation of low-angle grain boundaries (LAGBs) is enhanced. With fewer residue dislocations, it becomes less probable for the newly activated mobile dislocations to be impeded and transformed into an immobile type during the subsequent tensile test. The LAGBs function as potential sites to emit new dislocations, thus enhancing the dislocation-multiplication capability. More importantly, they can induce evident sub-grain refinement hardening and guarantee that the alloy achieves high strength. The findings lead to a controllable Mg alloy design strategy that can simultaneously afford high strength and ductility. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
资助项目	National Key Research and Development Program of China[2016YFB0701200] ; National Natural Science Foundation of China[51525101] ; National Natural Science Foundation of China[U1610253] ; National Natural Science Foundation of China[51701211] ; National Natural Science Foundation of China[51971053] ; Project of Promoting Talents in Liaoning province[XLYC1808038] ; State Key Laboratory of Solidification Processing in NPU[SKLSP201920] ; Fundamental Research Funds for the Central Universities[N170204011]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000518698300026
资助机构	National Key Research and Development Program of China ; National Natural Science Foundation of China ; Project of Promoting Talents in Liaoning province ; State Key Laboratory of Solidification Processing in NPU ; Fundamental Research Funds for the Central Universities
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/138126]
专题	金属研究所_中国科学院金属研究所
通讯作者	Zeng, Zhuoran; Huang, Qiuyan; Qin, Gaowu
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 2.Northeastern Univ, Sch Mat Sci & Engn, Key Lab Anisotropy & Texture Mat MoE, Shenyang 110819, Peoples R China 3.Northeastern Univ, State Key Lab Rolling & Automat, Shenyang 110819, Peoples R China 4.Monash Univ, Dept Mat Sci & Engn, Clayton, Vic 3800, Australia 5.Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Pan, Hucheng,Kang, Rui,Li, Jingren,et al. Mechanistic investigation of a low-alloy Mg-Ca-based extrusion alloy with high strength-ductility synergy[J]. ACTA MATERIALIA,2020,186:278-290.
APA	Pan, Hucheng.,Kang, Rui.,Li, Jingren.,Xie, Hongbo.,Zeng, Zhuoran.,...&Qin, Gaowu.(2020).Mechanistic investigation of a low-alloy Mg-Ca-based extrusion alloy with high strength-ductility synergy.ACTA MATERIALIA,186,278-290.
MLA	Pan, Hucheng,et al."Mechanistic investigation of a low-alloy Mg-Ca-based extrusion alloy with high strength-ductility synergy".ACTA MATERIALIA 186(2020):278-290.