李学哲,陈立佳,马春艳

• 1:沈阳工业大学材料科学与工程学院
• 2:沈阳工业大学材料科学与工程学院
• 3:沈阳工业大学材料科学与工程学院 辽宁沈阳110023
• 4:沈阳职业技术学院

摘要(Abstract)：

研究了固溶、时效处理对挤压变形AZ81镁合金在疲劳加载条件下的循环应力响应行为、循环应力-应变行为、应变疲劳参数以及疲劳寿命的影响。结果表明,热处理可导致挤压变形AZ81镁合金的循环应力幅有所降低;固溶处理和固溶+时效处理可有效提高挤压变形AZ81镁合金在较高总应变幅下的疲劳寿命;不同处理状态的挤压变形AZ81镁合金的弹性应变幅、塑性应变幅与疲劳断裂时的载荷反向周次之间的关系可分别用Basquin和Coffin-Manson公式描述;挤压态、时效态以及固溶+时效态的挤压变形AZ81镁合金的循环应力幅与塑性应变幅之间的关系可用单斜率直线描述,而固溶态的挤压变形AZ81镁合金的循环应力幅与塑性应变幅之间则呈现双斜率线性行为。

关键词(KeyWords)： 镁合金;挤压变形;热处理;循环应力响应;疲劳寿命

Abstract:

Keywords:

基金项目(Foundation): 辽宁省科技厅重点实验室专项计划(2004404006)

作者(Author): 李学哲,陈立佳,马春艳

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