【摘要】 目的研究Mn对Mg-4Zn合金再结晶组织演变和力学性能的影响,发展高性能Mg-Zn-Mn变形镁合金。方法以Mg-Zn镁合金为研究对象,利用Mn元素的固溶强化增塑、刺激再结晶形核和钉扎再结晶晶界的特点,通过Mg-Zn-Mn挤压镁合金的显微组织以及室温力拉伸和压缩力学性能测试,分析挤压过程中显微组织的演变和成分对力学性能的影响。结果 Mg-4Zn-2Mn合金平均晶粒尺寸为~7μm,其拉伸屈服强度、抗拉强度、伸长率、压缩屈服强度和拉压不对称性分别为226 MPa,316 MPa,17%,171 MPa,0.75。结论合金化元素Mn可有效细化变形镁合金的再结晶组织,随Mn元素含量的增加,Mg-Zn合金再结晶组织不断细化,未再结晶区域增加,合金力学性能增加,拉压不对称性改善。更多还原

【Abstract】 The paper aims to study the effect of Mn on recrystallization structure evolution and mechanical properties of Mg-4 Zn alloy, to develop high-performance Mg-Zn-Mn wrought magnesium alloy. This work took Mg-Zn-Mn magnesium alloy as the research object, and made use of the solid solution strengthening and ductilizing of Mn element, stimulation of recrystallization nucleation and pinning of recrystallization grain boundaries. The microstructure of as-extruded Mg-Zn-Mn alloy and the mechanical properties of tensile and compression at room temperature were tested to analyze the effect of microstructure evolution and component during extruding on the mechanical properly. The average grain size of Mg-4 Zn-2 Mn alloy was ~7 μm, and its tensile yield strength, tensile strength, elongation, compressive yield strength and tension and compression asymmetry were226 MPa, 316 MPa, 17%, 171 MPa and 0.75, respectively. Alloying element Mn can effectively refine the recrystallization structure of the alloy. With the increase of Mn content, the recrystallization structure of Mg-Zn alloy is continuously refined, the area of unrecrystallization increases, the strength of the alloy is enhanced, and the tension and compression asymmetry are improved.更多还原