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A rolled Mg−8Al−0.5Zn−0.8Ce alloy with high strength-ductility synergy via engineering high-density low angle boundaries

Authors :
Xiao Ma
Min Zha
Siqing Wang
Yi Yang
Hailong Jia
Dan Gao
Cheng Wang
Huiyuan Wang
Source :
Journal of Magnesium and Alloys, Vol 10, Iss 10, Pp 2889-2900 (2022)
Publication Year :
2022
Publisher :
KeAi Communications Co., Ltd., 2022.

Abstract

Developing low-cost rolled Mg alloys with both high strength and ductility is desirable, while the improved strength is generally accompanied with decreased ductility. Here, by using rotated hard-plate rolling (RHPR) with a total thickness reduction of ∼85%, we obtained a Mg−8Al−0.5Zn−0.8Ce (wt.%, AZ80−0.8Ce) alloy with a high strength-ductility synergy, i.e., the yield strength (YS), ultimate tensile strength (UTS) and elongation-to-failure (EF) are ∼308 MPa, ∼360 MPa and ∼13.8%, respectively. It reveals that the high YS is mainly originated from grain boundary strengthening (∼212 MPa), followed by dislocation strengthening (∼43 MPa) and precipitation hardening (∼25 MPa). It is found that a relatively homogeneous fine grain structure containing a large fraction (∼62%) of low angle boundaries (LABs) is achieved in the RHPRed alloy, which is benefit for the high tensile EF value. It demonstrates that LABs have important contributions to strengthening and homogenizing tensile deformation process, leading to the simultaneous high strength and high EF. Our work provides a new insight for fabrication of low-cost high performance Mg alloys with an excellent strength-ductility synergy.

Details

Language :
English
ISSN :
22139567
Volume :
10
Issue :
10
Database :
Directory of Open Access Journals
Journal :
Journal of Magnesium and Alloys
Publication Type :
Academic Journal
Accession number :
edsdoj.823bcdada03c499896ef15bf1ec58b50
Document Type :
article
Full Text :
https://doi.org/10.1016/j.jma.2021.12.008