摘要
采用熔炼铸造法制备了添加1%~5%Sm(质量分数)的Mg-10Gd-0.5Zr合金,通过拉伸性能测试、扫描电镜、X射线衍射分析研究了Sm对合金显微组织和力学性能的影响。结果表明:Sm的加入形成了Mg41Sm5相,并促进了Mg_5Gd相析出。固溶时效处理后,晶界处粗大共晶组织溶解,析出相弥散分布,3%Sm的合金晶粒较细小,5%Sm的合金中出现短棒状Mg_5Gd相。在相同实验温度下,随着Sm含量的增加,合金的强度先升高后降低,3%Sm的合金抗拉强度最大。对于同一种合金,随着拉伸温度的升高抗拉强度先升高后降低,加入0%~1%Sm的合金抗拉强度峰值出现在200℃,加入3%~5%Sm的合金抗拉强度峰值出现在250℃。抗拉强度具有明显的反常温度效应,而且Sm的加入强化了这种反常温度效应并使强度峰值出现的温度升高。
Mg-10 Gd-0.5 Zr alloys with 1 wt%~5 wt% Sm addition were prepared by a melting and casting method. The effect of Sm onmicrostructures and mechanical properties were investigated by tensile tests, SEM and XRD. The results show that the Mg_(41)Sm_5 phase isfound because of Sm addition, and Sm promotes the precipitation of Mg_5Gd. After solution-aging treatment, the coarsening eutecticstructures at grain boundary are dissolved and the precipitation disperses homogeneously. The finer grain size is observed when thecontent of Sm comes to 3 wt%. Some of Mg_5Gd phase become short rod-like when Sm addition is 5 wt%. At the same experimentaltemperature, the strength of tested alloys increases at first and then decreases, and the peak strength appears when the content of Sm is 3 wt%. For the same alloy, with increasing of test temperature, the strength increases at first and then decreases too. When the Sm contentis 0~1 wt%, the temperature of tensile strength peak is 200 oC while when Sm content is 3 wt%~5 wt% the temperature is 250 oC. There isan abnormal temperature effect in tensile tests; the Sm addition reinforces the effect and increases the temperature of tensile strength peak.
引文
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