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

作　　者：Xiao Ma Min Zha Siqing Wang Yi Yang Hailong Jia Dan Gao Cheng Wang Huiyuan Wang 

机构地区：[1]Key Laboratory of Automobile Materials of Ministry of Education&School of Materials Science and Engineering,Nanling Campus,Jilin University,No.5988 Renmin Street,Changchun 130025,PR China [2]State Key Laboratory of Super hard Materials,Jilin University,Changchun,130012,PR China [3]International Center of Future Science,Jilin University,Changchun 130012,PR China

出　　处：《Journal of Magnesium and Alloys》2022年第10期2889-2900,共12页镁合金学报（英文）

基　　金：primarily supported by The Natural Science Foundation of China under Grant Nos.51922048,51871108 and 52001133;the Fundamental Research Funds for the Central Universities,JLU,Program for JLU Science and Technology Innovative Research Team(JLUSTIRT,2017TD-09);The Science and Technology Development Program of Jilin Province(Nos.20200201193JC and 20210201115GX)。

摘　　要：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.

关 键 词：Mg-Al-Zn alloys Rolling Strengthening mechanism Microstructure Strength-ductility synergy 

分 类 号：TG146.22[一般工业技术—材料科学与工程]