A rolled Mg-8Al-0.5Zn-0.8Ce alloy with high strength-ductility synergy via engineering high-density low angle boundaries
A rolled Mg-8Al-0.5Zn-0.8Ce alloy with high strength-ductility synergy via engineering high-density low angle boundaries
复制标题
通过设计高密度小角度边界，具有高强度-延展性协同作用的轧制 Mg-8Al-0.5Zn-0.8Ce 合金
DOI：
10.1016/j.jma.2021.12.008
复制
发表时间：
2022-10-01
影响因子：
17.6
通讯作者：
Wang, Huiyuan
中科院分区：
文献类型：
--
作者：
Ma, Xiao;Zha, Min;Wang, Huiyuan
开发具有高强度和延展性的低成本轧制镁合金是可取的，但强度的提高通常伴随着延展性的下降。在这里，通过使用总厚度减少约85％的旋转硬板轧制（RHPR），我们获得了具有高强度-延展性协同作用的Mg-8Al-0.5Zn-0.8Ce（wt.%，AZ80-0.8Ce）合金，即屈服强度（YS）、极限拉伸强度（UTS）和断裂伸长率（EF）与308 MPa相似，分别为 360 MPa 和 13.8%。结果表明，高YS主要来源于晶界强化（约212 MPa），其次是位错强化（约43 MPa）和沉淀硬化（约25 MPa）。研究发现，RHPRed 合金中获得了相对均匀的细晶结构，其中含有大量（大约 62%）的小角度晶界（LAB），这有利于高拉伸 EF 值。这表明 LAB 对强化和均匀化拉伸变形过程具有重要贡献，从而同时实现高强度和高 EF。我们的工作为制造具有优异强度-延展性协同作用的低成本高性能镁合金提供了新的见解。 (C) 2022 重庆大学。 Elsevier B.V. 代表科爱通讯有限公司提供的出版服务
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 similar to 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 similar to 308 MPa, similar to 360 MPa and similar to 13.8%, respectively. It reveals that the high YS is mainly originated from grain boundary strengthening (similar to 212 MPa), followed by dislocation strengthening (similar to 43 MPa) and precipitation hardening (similar to 25 MPa). It is found that a relatively homogeneous fine grain structure containing a large fraction (similar to 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. (C) 2022 Chongqing University. Publishing services provided by Elsevier B.V. on behalf of KeAi Communications Co. Ltd.