在蠕变应力为5.13～11.06 MPa范围内,研究AZ31镁合金中Zn含量对其高温蠕变性能和蠕变应力指数的影响.结果表明:在同样的蠕变条件下,随着Zn含量的增加,合金的蠕变速率增加,稳态蠕变速率区域缩短;应力指数不仪与Zn含量有关,而且与蠕变温度和应力有关;390℃时,不同Zn含量的AZ31合金几乎具有相同的应力指数:420℃时,Zn含量为0.78%的AZ31合金随应力增加山现n=1和n≈3的两阶段变化,Zn含量为1.53%的AZ31合金随应力增加则出现应力指数分别为n=1、n≈3和n=6的三阶段变化.
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