ZL101A合金低温疲劳性能和断裂行为研究  

Low Temperature Fatigue Properties and Fracture Behavior of ZL101A

作　　者：马昌龙 宋丽英 郑黎[1] 于宝义[1] 李润霞 MA Chang-long;SONG Li-ying;ZHENG Li;YU Bao-yi;LI Run-xia(School of Material Science and Engineering,Shenyang University of Technology,Shenyang 110870,Liaoning,China;Dongguan University of Technology,Dongguan 523000,Guangdong,China)

机构地区：[1]沈阳工业大学材料科学与工程学院,辽宁沈阳110870 [2]东莞理工学院,广东东莞523000

出　　处：《铸造》2020年第5期461-468,共8页Foundry

摘　　要：研究了ZL101A合金的低温拉伸性能和低温疲劳性能,对断口形貌进行了观察,分析了疲劳断裂的微观机制。结果表明:服役温度对合金疲劳寿命及断裂机制有显著的影响。随着服役温度的降低,合金疲劳寿命提高。室温条件下断口主要以穿晶断裂为主,同时伴随局部沿晶断裂特征,而-40℃条件下合金断裂行为表现出较强的晶体学裂纹特征。与室温相比,合金在低温下的疲劳断口瞬断区面积增大,粗糙度有所升高。而相同温度下,合金随着应变幅的增加,合金低温疲劳的断口粗糙度有所降低。The low-temperature tensile properties and low-temperature fatigue properties of ZL101A alloy were studied.The fracture morphologies were observed,and the initiation and propagation of fatigue fracture were analyzed.The results show that the service temperature has a significant effect on the fatigue life and fracture mechanism of the alloy.The fracture at room temperature is mainly transgranular fracture,accompanied by local intergranular fracture characteristics,and the fracture behavior of the alloy at-40℃shows strong crystallographic crack characteristics.Compared with room temperature,the area of instantaneous fracture area of the fatigue fracture specimen at low temperature increases,and the roughness also increases.At the same temperature,the roughness of the fatigue fracture of the alloy at low temperature decreases as the strain amplitude of the alloy increases.

关 键 词：ZL101A铝合金 低温疲劳性能 疲劳断口 断口粗糙度 

分 类 号：TG[金属学及工艺]