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研究了不同混合稀土添加量的ZM5+xRE合金(x=0.4、0.8、1.2、1.6、2.0,质量分数,%)铸态及固溶状态的显微组织与力学性能。结果表明,混合稀土能够使ZM5+xRE合金铸态组织中基体相α-Mg的晶粒细化,晶界处的β-Mg17Al12相由不连续的网状转变为颗粒状,并形成杆状稀土相;进一步的固溶处理不仅使β-Mg17Al12相充分溶解,还可使粗大的杆状稀土相逐渐熔断,球化。综合考虑混合稀土及固溶处理对ZM5+xRE合金组织性能的影响,添加0.8%的混合稀土及410℃、25 h的固溶处理,对提高ZM5+xRE合金力学性能最为有效。
The microstructures and mechanical properties of as-cast and solutionized ZM5 + xRE alloys (x = 0.4,0.8,1.2,1.6,2.0, mass fraction,%) with different mischmetal additions were studied. The results show that the mixed rare earth can refine the grain size of the matrix phase α-Mg in the as-cast microstructure of ZM5 + xRE alloy. The β-Mg17Al12 phase in the grain boundary changes from discontinuous mesh to granular, Phase; further solution treatment not only make the β-Mg17Al12 phase fully dissolved, but also make the coarse rod-shaped rare earth phase gradually melt, spheroidization. Considering the effect of mixed rare earth and solution treatment on the microstructure and properties of ZM5 + xRE alloy, addition of 0.8% rare earth and solution treatment at 410 ℃ for 25 h are the most effective ways to improve the mechanical properties of ZM5 + xRE alloy.