Abstract
对热挤压、时效处理（T5态）及固溶＋时效处理（T6态）Mg-7%Zn-0.6%Zr-0.5%Y合金（质量分数）分别进行了低周疲劳实验,探讨了热处理对合金低周疲劳变形行为的影响.结果表明：时效处理和固溶＋时效处理可提高热挤压Mg-7%Zn-0.6%Zr-0.5%Y合金的循环变形抗力;时效处理降低了合金的疲劳寿命,固溶＋时效处理可以提高合金在较高外加总应变幅下的疲劳寿命,但降低合金在较低外加总应变幅下的低周疲劳寿命;不同状态合金的弹性应变幅和塑性应变幅与载荷反向周次的关系可分别用Basquin和Coffin-Manson公式来描述;时效及固溶＋时效处理过程中形成的长周期堆垛有序结构（LPSO相）是合金的循环变形抗力大幅提高的主要原因,而疲劳变形过程中形成的孪晶可能是时效态合金疲劳寿命降低的原因.
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