【摘要】 利用铸锭冶金的方法制备了Mg-4.9Zn-0.9Y-0.7Zr合金及对比合金Mg-4.9Zn-0.7Zr,研究了Y元素的添加对合金组织性能的影响。通过XRD对合金进行了物相分析,运用SEM观察了元素Y对合金铸态组织的影响,通过EDAX,TEM技术对第二相化学成分及形貌进行了分析。研究结果表明:Y是Mg-Zn-Zr镁合金强韧化的有效元素,Y的加入使得合金中生成大量Mg3Zn6Y相。在热轧过程中,Mg3Zn6Y相被破碎成大量弥散细小的质点,这些小质点严重阻碍了位错,从而提高了合金在室温下的抗拉强度及屈服强度,同时合金仍然保持着良好的塑性。更多还原

【Abstract】 Mg-4.9Zn-0.9Y-0.7Zr alloy and Mg-4.9Zn-0.7Zr alloy were prepared by ingot metallurgy method.The influence of Y addition on microstructure and properties was studied.Phase analysis,microstructure and morphology of second phases were investigated by XRD,OM and SEM.The component and morphology of the second phases was analyzed by EDAX and TEM.The results showed that Y was an effective element strengthening Mg-Zn-Zr alloy and a large number of Mg3Zn6Y phase formed due to the addition of Y.During the process of hot rolling,Mg3Zn6Y phase was pulverized into large amount of dispersion particles,which pinned dislocation effectively,so ultimate strength and yield strength at room temperature were improved,as well as good plasticity was remained.更多还原