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Mechanistic investigation of a low-alloy Mg-Ca-based extrusion alloy with high strength-ductility synergy
Pan, Hucheng1; Kang, Rui1; Li, Jingren1; Xie, Hongbo2; Zeng, Zhuoran3; Huang, Qiuyan4; Yang, Changlin5; Ren, Yuping1; Qin, Gaowu2
Corresponding AuthorZeng, Zhuoran(zhuoran.zeng@monash.edu) ; Huang, Qiuyan(gyhuang16b@imr.ac.cn) ; Qin, Gaowu(qingw@smm.neu.edu.cn)
2020-03-01
Source PublicationACTA MATERIALIA
ISSN1359-6454
Volume186Pages:278-290
AbstractHigh 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.
KeywordMg wrought alloy Mechanical property Low-angle grain boundary Dynamic recrystallisation Pyramidal dislocations
Funding OrganizationNational 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
DOI10.1016/j.actamat.2020.01.017
Indexed BySCI
Language英语
Funding ProjectNational 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 Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000518698300026
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Cited Times:64[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/138128
Collection中国科学院金属研究所
Corresponding AuthorZeng, Zhuoran; Huang, Qiuyan; Qin, Gaowu
Affiliation1.Northeastern Univ, Sch Mat Sci & Engn, Key Lab Anisotropy & Texture Mat MoE, Shenyang 110819, Peoples R China
2.Northeastern Univ, State Key Lab Rolling & Automat, Shenyang 110819, Peoples R China
3.Monash Univ, Dept Mat Sci & Engn, Clayton, Vic 3800, Australia
4.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
5.Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China
Recommended Citation
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.
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