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对Mg-5.13Zn-4.02Y-0.54Zr(wt%)合金的组织、室温和高温力学性能进行研究。结果表明,添加合金元素Y,引入了大量三元化合物Mg3Y2Zn3(W相);W相在热挤压过程中碎化,弥散分布于合金内,使挤压态合金获得晶粒尺寸为2～3μm的细晶组织,极大提高了合金力学性能;该合金在25、150和200℃时的屈服强度分别达到310、250和237 MPa,明显优于WE54等商用耐热镁合金的高温力学性能,表明W相能有效提高镁合金的高温力学性能。
The microstructure, room temperature and high temperature mechanical properties of Mg-5.13Zn-4.02Y-0.54Zr (wt%) alloy were studied. The results show that a large amount of ternary compound Mg3Y2Zn3 (W phase) is added by adding alloying element Y. The W phase is fragmented and dispersed in the alloy during the hot extrusion process, so that the grain size of the extruded alloy is 2~3 μm , Which greatly improved the mechanical properties of the alloy. The yield strength of the alloy reaches 310, 250 and 237 MPa at 25, 150 and 200 ℃ respectively, which is obviously better than the high temperature mechanical properties of commercial heat-resistant magnesium alloys such as WE54. W phase can effectively improve the high-temperature mechanical properties of magnesium alloys.