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中文摘要：
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。
英文摘要：
The microstructure and mechanical properties at room temperature and elevated temperature of Mg-5.13Zn4.02Y-0.54Zr（wt%） alloy were investigated.The results show that W phase（Mg3Y2Zn3） is introduced by the addition of Y in ZK51 alloy.The dispersed distribution of W phase is fragmented during hot extrusion,which can improve the mechanical properties of the extruded alloy greatly due to the extremely fine grains with size of 2～3 μm.The mechanical properties of the extruded alloy with yield strength of 310 MPa,250 MPa and 237 MPa at 25 ℃,150 ℃ and 200 ℃,respectively,are remarkably better than those of WE54 commercial alloy used at elevated temperature successfully.W phase is demonstrated to be a second phase,which can promote the mechanical properties of magnesium alloy at elevated temperature.
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