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采用XRD、OM和SEM等手段研究AM60合金中加入Sm和Ti后的组织和性能,并分别分析Sm和Ti对合金组织和性能的影响。结果表明,适量加入Sm和Ti都可以使合金组织得到极大地细化,减少了β相的析出,加入Ti后合金有少量的Al3Ti生成;Sm、Ti的复合加入则形成颗粒状Al2Sm、Mg41Sm5相和晕圈状球形化合物Al18Ti2Mg3,Ti的变质作用和适当的T6处理使合金中的杆状相钝化或者消失,粗大颗粒相变得圆整细小。复合添加比单独添加得到更优的力学性能,同时加入1.0%Sm和0.4%Ti,合金室温抗拉强度和伸长率分别达到226MPa和6.7%,比母合金分别提高了34.5%和39.6%;200℃高温抗拉强度和伸长率分别达到170MPa和10.4%,比母合金分别提高53.2%和82.5%。T6处理可以进一步提高该合金的力学性能。
The microstructure and mechanical properties of AM60 alloy were studied by XRD, OM and SEM. The effects of Sm and Ti on the microstructure and properties of the alloy were analyzed respectively. The results show that the proper addition of Sm and Ti can make the microstructure of the alloy greatly refined and the precipitation of β phase reduced, and a small amount of Al3Ti is formed in the alloy after addition of Ti. When Sm and Ti are added in combination, granular Al2Sm and Mg41Sm5 phases are formed And halo spherical compound Al18Ti2Mg3, Ti metamorphism and proper T6 treatment passivated or disappeared the rod-like phase in the alloy, and coarse particles became round and small. The addition of 1.0% Sm and 0.4% Ti, the tensile strength and elongation at room temperature of the alloy reached 226MPa and 6.7% respectively, which were 34.5% and 39.6% higher than that of the mother alloy respectively. 200 ℃ high temperature tensile strength and elongation reached 170MPa and 10.4%, respectively, than the mother alloy increased by 53.2% and 82.5%. T6 treatment can further improve the mechanical properties of the alloy.