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利用SEM、XRD和EDS等手段研究了单独和复合添加微量Y、Er元素对AZ91镁合金微观组织的影响,并测试分析了合金的室温及高温力学性能。结果表明:单独和复合添加适量的Y、Er元素对AZ91镁合金微观组织都有一定程度的细化作用,连续网状分布的β-Mg17Al12相减少,复合添加对晶粒细化效果更为明显;单加Y和单加Er元素时,分别会有颗粒状Al2Y和杆状Al3Er化合物生成;复合添加时,颗粒状Al2Y中的部分Y和杆状Al3Er中的部分Er分别会被Er和Y所置换。相对于单独添加,复合添加对合金的综合力学性能的影响更为明显,随着复合添加量的增多,合金试样的抗拉强度和延伸率都呈现先增大后减小的趋势。
The effects of adding Y, Er elements alone or in combination on the microstructure of AZ91 magnesium alloy were studied by means of SEM, XRD and EDS. The mechanical properties at room temperature and high temperature were tested and analyzed. The results show that adding proper amount of Y and Er elements alone or in combination can refine the microstructure of AZ91 magnesium alloy to a certain degree. The β-Mg17Al12 phase with continuous reticular distribution decreases, and the effect of compound addition on grain refinement is more obvious ; When Y and Y are added singly, granular Al2Y and rod-shaped Al3Er compounds are respectively generated; when the composite is added, part Y in the granular Al2Y and part Er in the rod-shaped Al3Er are respectively formed by Er and Y Replacement. Compared with the additive alone, the effect of the composite addition on the mechanical properties of the alloy is more obvious. With the increase of the composite addition, the tensile strength and elongation of the alloy sample first increase and then decrease.