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通过光学显微镜(OM)、透射电镜(TEM)、X射线衍射(XRD)及室温到300℃的拉伸试验,研究了Mg-(6,9,12,15)Gd-1Sm-0.5Zr镁合金显微组织和力学性能的影响。结果表明:时效态Mg-Gd-Sm-Zr系镁合金由α-Mg基体和Mg5Gd相组成。适量Gd元素的添加能够细化合金组织、提高合金室温和高温的力学性能。在Gd含量达到和超过9 mass%后,合金出现抗拉强度反常温度效应,本文初步探讨了出现这种现象的微观机理。合金伸长率在200℃以下时,随Gd添加量的增加而减小;超过200℃后,伸长率随Gd添加量的增大而增大。
The mechanical properties of Mg- (6,9,12,15) Gd-1Sm-0.5Zr magnesium alloy were investigated by optical microscope (OM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and tensile test at room temperature up to 300 ℃. Effect of Microstructure and Mechanical Properties. The results show that the aging Mg-Gd-Sm-Zr magnesium alloy consists of α-Mg matrix and Mg5Gd phase. Appropriate addition of Gd element can refine the alloy structure and improve the mechanical properties of the alloy at room temperature and high temperature. After the Gd content reached more than 9 mass%, the alloy exhibited anomalous temperature effect of tensile strength. The microscopic mechanism of this phenomenon was initially discussed in this paper. The elongation of alloy decreases with the increase of Gd content below 200 ℃. When the elongation exceeds 200 ℃, the elongation increases with the increase of Gd content.