制备了Mg-4.9Zn-0.9Y-0.7Zr及Mg-4.9Zn-0.7Zr合金,研究了Y元素对合金组织性能的影响.通过XRD,分析了合金的物相组成,运用OM,SEM观察了合金的微观组织、第二相形貌;通过EDAX对第二相化学成分进行了定性分析.研究结果表明,Y使得合金中有大量I相生成.热轧过程中,I相转变成弥散细小的颗粒,能有效钉扎位错,提高了材料的抗拉强度及屈服强度,同时合金仍然保持着良好的塑性.
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