采用静态增重法研究了铸态AZ61镁合金在400～550℃下的恒温氧化动力学行为.利用扫描电镜(SEM)、X射线衍射分析(XRD)和激光粒度分析仪(LPSA)分别对氧化产物形貌、相组成和尺寸进行分析.结果表明:合金400℃时表现出良好的抗氧化性,温度升高抗氧化性降低；450℃和500℃时合金氧化动力学均遵循偏离平方抛物线规律；氧化产物为MgO；550℃时,合金氧化严重至燃烧,产物为MgO,Mg3N2和MgAl2O4.影响AZ61合金高温氧化的重要因素是共晶相的熔化温度,伴随β相的熔化,合金氧化过程经历全面氧化到选择性氧化的转变,基体严重氧化甚至燃烧.
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