摘要
研究了ＺＡ２７ 合金在室温下的低周疲劳性能， 得到两种处理状态下ＺＡ２７ 合金在恒应变幅下的循环应力—应变曲线， 并对两种状态下合金的显微组织及疲劳试件断口进行了显微分析． 结果表明： ＺＡ２７ 合金在铸态下表现为循环软化， 其原因与铸态组织晶粒的不均匀性以及内应力在循环应力作用下的衰减等有关； 热处理合金表现为循环硬化， 是由于热处理显微组织中沉淀相弥散、均匀、稳定地分布于基体中， 造成位错运动的障碍以及不断开动的位错源造成晶粒内位错密度迅速增加起到了循环硬化的作用．
The low cyclic fatigue properties of ZA27 alloy at ambient temperature is studied.The cyclic stress?strain curves of ZA27 alloy with different treatment have been obtained in constant strain amplitude condition and the corresponding microstructure,the fractograyh obtained under different treatment condition are presented.The resluts showed that the cyclic softening character for ZA27 foundry alloy appeared while the cyclic hardening character for ZA27 heat?trented alloy occured.
出处
《焦作工学院学报》
1999年第6期459-461,共3页
Journal of Jiaozuo Institute of Technology(Natural Science)
