Progress in Natural Science: Materials International ( IF 4.7 ) Pub Date : 2021-06-27 , DOI: 10.1016/j.pnsc.2021.06.001 Hongju Deng , Yan Yang , Minmin Li , Xiaoming Xiong , Guobing Wei , Weidong Xie , Bin Jiang , Xiaodong Peng , Fusheng Pan
The as-cast Mg–6Li–4Zn-xMn alloys were prepared and extruded at 280 °C with an extrusion ratio of 25:1. The effects of Mn content on the microstructure and mechanical properties of Mg–6Li–4Zn-xMn alloys were investigated in this study. The XRD results show that Mg–6Li–4Zn–xMn alloys consisted of α-Mg (hcp) + β-Li (bcc) duplex structured matrix, MgLi2Zn and Mn phases. The grains of the extruded Mg–6Li–4Zn–xMn alloys were refined by dynamic recrystallization during the extrusion process. The EBSD results show that the extruded alloys had basal textures. The grain size of the extruded alloys decreased while the basal texture was strengthened with the increasing Mn addition. The TEM results show that a large amount of nanoscale Mn precipitates existed in the extruded Mg–6Li–4Zn–1.2Mn alloy, which can effectively inhibit the dynamic recrystallized (DRXed) grains growth during the hot extrusion and is beneficial to the improvement of mechanical properties. Mg–6Li–4Zn–1.2Mn alloy in this research possesses the best mechanical properties with the ultimate tensile strength and yield strength of 321 MPa, 250 MPa, respectively.
中文翻译:
Mn含量对Mg-6Li-4Zn-xMn合金组织和力学性能的影响
制备了铸态 Mg-6Li-4Zn-xMn 合金,并在 280°C 下以 25:1 的挤压比进行挤压。本研究研究了 Mn 含量对 Mg-6Li-4Zn-xMn 合金组织和力学性能的影响。XRD 结果表明 Mg-6Li-4Zn-xMn 合金由 α-Mg (hcp) + β-Li (bcc) 双相结构基体组成,MgLi 2Zn 和 Mn 相。在挤压过程中,挤压出的 Mg-6Li-4Zn-xMn 合金的晶粒通过动态再结晶细化。EBSD 结果表明挤压合金具有基础织构。随着Mn添加量的增加,挤压合金的晶粒尺寸减小,而基底织构增强。TEM 结果表明,挤压出的 Mg-6Li-4Zn-1.2Mn 合金中存在大量纳米级 Mn 析出物,可以有效抑制热挤压过程中动态再结晶(DRXed)晶粒的生长,有利于提高力学性能。特性。本研究中的 Mg-6Li-4Zn-1.2Mn 合金具有最佳的力学性能,极限抗拉强度和屈服强度分别为 321 MPa、250 MPa。