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Effect of Mn content on the microstructure and mechanical properties of mg–6li–4zn-xmn alloys

Progress in Natural Science:Materials International 2021年第4期31卷 583-590页

作者： Hongju Deng Yan Yang Minmin li Xiaoming Xiong Guobing Wei Weidong Xie Bin Jiang Xiaodong Peng Fusheng Pan International Joint Laboratory for light alloys (MOE) College of Materials Science and Engineering Chongqing University State Key Laboratory of Mechanical Transmissions College of Materials Science and Engineering Chongqing University National Engineering Research Center for Magnesium alloys Chongqing University

The as-cast mg–6li–4zn-x Mn alloys were prepared and extruded at 280℃ with an extrusion ratio of 25:1. The effects of Mn content on the microstructure and mechanical properties of mg–6li–4zn-x Mn alloys were investigated in this study. The XRD results show that mg–6li–4zn–x Mn alloys consisted of α-mg(hcp) + β-li(bcc)duplex structured matrix, mg lizn and Mn phases. The grains of the extruded mg–6li–4zn–x Mn 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–1.2 Mn alloy, which can effectively inhibit the dynamic recrystallized(DRXed) grains growth during the hot extrusion and is beneficial to the improvement of mechanical ***–6li–4zn–1.2 Mn alloy in this research possesses the best mechanical properties with the ultimate tensile strength and yield strength of 321 MPa, 250 MPa, respectively.

关键词： mg–6li–4zn-xmn alloys Extrusion Microstructure Mechanical properties

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