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借助OM、XRD、SEM和电子拉力试验机,对Mg-(4、7、10、13、16)Gd-0.5Zr合金的铸态显微组织和力学性能进行研究,并通过计算“点阵错配度”研究了合金的组织细化机制。结果表明:稀土元素Gd含量的增加,对Mg-x Gd-0.5Zr合金铸态组织有强烈的细化作用,生成了高熔点的Mg_5Gd相。合金的室温力学性能有显著提高。合金断口具有沿晶断裂+局部解理断裂的特征。稀土元素Gd对Mg-x Gd-0.5Zr合金力学性能的提升作用,可归结为以细晶强化为主,固溶强化为辅的共同作用机制。
The as-cast microstructure and mechanical properties of Mg- (4,7,10,13,16) Gd-0.5Zr alloy were investigated by means of OM, XRD, SEM and electronic tensile testing machine. Mismatch "studied the alloy thinning mechanism. The results show that the increase of Gd content of rare earth elements strongly attenuates the as-cast microstructure of Mg-xGd-0.5Zr alloy and produces Mg_5Gd phase with high melting point. The room temperature mechanical properties of the alloy have been significantly improved. The fracture of the alloy has the characteristics of intergranular fracture + local cleavage fracture. The effect of rare earth element Gd on the mechanical properties of Mg-xGd-0.5Zr alloy can be attributed to the synergistic effect of fine-grain strengthening and solid solution strengthening.