AZ91D应变状态下低周疲劳行为的研究  

Research on Low Cycle Fatigue Behavior of Magnesium Alloy AZ91D with Strain Condition

作　　者：丰崇友[1] 张征宇[1] 李莉平[1] 白洪金[1] 

机构地区：[1]嘉兴职业技术学院机电与汽车分院,浙江嘉兴314036

出　　处：《佳木斯大学学报（自然科学版）》2012年第1期99-101,共3页Journal of Jiamusi University：Natural Science Edition

基　　金：浙江省教育厅科研项目(Y201120023);嘉兴市科技局项目(2009BY7006)

摘　　要：对AZ91D镁合金进行了应变控制单轴加载的低周疲劳试验研究,结果表明:AZ91D镁合金在低周载荷下,当循环应变幅值小于0.4%,材料表现出循环软化.随着循环应变幅值的增加,材料表现出明显的循环硬化现象;且随着应变幅值的增加材料的附加强化程度增大.当总应变幅大于1.0%,曲线的斜率基本不变,即循环应变硬化率大致相同.应变幅值对材料低周疲劳寿命有较大影响,随着应变幅值的提高,疲劳寿命降低.运用Coffin-Manson公式进行寿命预测,在高应变幅值下有较好的一致性.The low cycle fatigue tests of AZglD magnesium alloy by controlling me total strata ampmuae were carried out. Results show that materials show cyclic softening when cycled strain amplitude is less than 0. 4%. Along with the increase of the cyclical strain amplitude, material displays obviously cyclic hardening; and with the strain amplitude of the increase, the additional strengthening degree of materials increases. The slope of the curve basically unchanged when the total strain is more than 1.0%, namely the circulation strain hardening rate roughly the same. Strain amplitude has great influence on low cycle fatigue life on the material： with the in- crease of strain amplitude, fatigue life decreases. The low cycle fatigue life can be predicted using the Coffin Manson formula; the consistency is good in high strain amplitude.

关 键 词：AZ91D镁合金 应变 力学性能 低周疲劳 

分 类 号：TG146.2[一般工业技术—材料科学与工程]