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利用光学显微镜、X射线衍射和扫描电镜等对挤压态和时效态Mg-6Zn-1Mn-4Sn和Mg-6Zn-1Mn-4Sn-0.5Y镁合金的微观组织和力学性能进行研究。结果表明:与ZMT614镁合金相比,添加Y元素后,ZMT614-0.5Y晶粒得到细化,综合力学性能得到提高。Mg-6Zn-1Mn-4Sn-0.5Y合金的相组成为α-Mg、Mg Zn2、Mn、Mg2Sn和MgS n Y相。经过T6热处理后,合金的抗拉强度和屈服强度明显得到提高,伸长率明显被降低。理论计算表明,在挤压态合金中,细晶强化和固溶强化产生重要的作用,而在T6热处理态合金中,析出强化产生决定作用。
The microstructures and mechanical properties of Mg-6Zn-1Mn-4Sn and Mg-6Zn-1Mn-4Sn-0.5Y magnesium alloys were studied by means of optical microscope, X-ray diffraction and scanning electron microscopy. The results show that compared with ZMT614 magnesium alloy, ZMT614-0.5Y grains are refined and the mechanical properties are improved after Y element addition. The phase compositions of the Mg-6Zn-1Mn-4Sn-0.5Y alloy are α-Mg, Mg Zn2, Mn, Mg2Sn and MgS n Y phases. After T6 heat treatment, the tensile strength and yield strength of the alloy were significantly improved, the elongation was significantly reduced. The theoretical calculations show that the fine grain strengthening and solid solution strengthening have an important role in the as-extruded alloy, whereas the precipitation hardening has a decisive role in the T6 heat-treated alloy.