材料科学
极限抗拉强度
合金
延展性(地球科学)
晶界
冶金
沉淀硬化
加工硬化
降水
变形(气象学)
延伸率
复合材料
微观结构
蠕动
物理
气象学
作者
Xiao Ma,Min Zha,Siqing Wang,Yang Yang,Hai-Long Jia,Dan Gao,Cheng Wang,Huiyuan Wang
标识
DOI:10.1016/j.jma.2021.12.008
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.
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