一种Al-Cu-Mg-Zr合金的疲劳裂纹扩展行为研究  

Fatigue Crack Propagation Behavior of Al-Cu-Mg-Zr Alloy

作　　者：郑子樵[1] 孙晓旭[1] 陈圆圆[1] 魏修宇[1] 

机构地区：[1]中南大学,湖南长沙410083

出　　处：《稀有金属材料与工程》2010年第6期975-979,共5页Rare Metal Materials and Engineering

基　　金：国家重点基础研究发展规划资助项目(2005CB623705)

摘　　要：研究热处理状态、应力比和试样取向等对含Zr的Al-Cu-Mg系铝合金疲劳裂纹扩展行为的影响。结果表明,T3、T4两种热处理状态试样的疲劳裂纹扩展速率没有明显差别;L-T方向和T-L方向的试样也有大致相同的疲劳裂纹扩展速率;应力比R对疲劳裂纹扩展行为有明显影响,高应力比下的疲劳裂纹扩展速率明显快于低应力比条件下的扩展速率,并且高应力比下的疲劳裂纹扩展在较小的△K值下进入快速扩展阶段,并很快断裂。在较低的△K水平下应力比的影响与裂纹闭合效应有关。The influence of heat treatment, specimen orientation and stress ratio on the fatigue crack propagation behavior of Al-Cu-Mg alloy containing Zr was studied. The results show that the difference of fatigue crack propagation rates between T3 and T4 temper specimens was not obvious. The effect of specimen orientation on the crack propagation rates was less significant. The fatigue crack propagation rates of the specimens in the L-T orientation and T-L orientation were similar. However, the stress ratio had a remarkable influence on the fatigue crack propagation rates; at the higher stress ratio, the fatigue crack propagation rates increased and the fatigue crack propagated rapidly into the high crack propagation regime to failure at lower ？K levels. The effect of stress ratio at near-threshold levels could be explained by a crack closure concept

关 键 词：疲劳裂纹扩展速率 Al-Cu-Mg-Zr合金 应力比 疲劳断口形貌分析 

分 类 号：TG146.21[一般工业技术—材料科学与工程]