铜铝复合接触线用银铜合金疲劳试验  

Low Cycle Fatigue Behavior of Cu-Ag Alloy for Cu Cladding Al Contact Wire

作　　者：张迎晖[1] 孙洪波[1] 肖翔[1] 熊仕显[1] 杨斌[1] 

机构地区：[1]江西理工大学材料与化学工程学院

出　　处：《特种铸造及有色合金》2009年第12期1172-1174,共3页Special Casting & Nonferrous Alloys

基　　金：国家高技术研究发展计划(863计划)资助项目(2006AA03Z531);江西省科技支撑计划项目(2007BG13000)

摘　　要：通过采用不同应变幅控制,对不同变形量冷拉银铜合金进行室温低周疲劳试验。结果表明,随着应变幅的增大,滞后环面积也随之增大;随着循环周次的增加,循环应力逐渐降低,从而产生疲劳软化;加工率为38%的银铜合金循环周期大于加工率为19%的银铜合金循环周期;试样断裂后存在三个明显疲劳特征区:裂纹源、裂纹扩展区、瞬断区;银铜合金的裂纹扩展具有穿晶和沿晶两种方式。Low cycle fatigue behavior of Cu-Ag alloy for Cu cladding Al contact wire was tested by using different strain amplitude control with varied deformation rate.The results reveal that with increasing in strain amplitude,area of hysteresis loop is increased.With increasing in cycling times,cycling stress is gradually decreased to lead to the appearance of fatigue softening.The cycling period of Cu-Ag alloy with 38% deformation rate is higher than that of one with 19% deformation rate.The fracture morphology of the alloy is composed of crack,crack propagation and rupture.The crack propagation of the Cu-Ag alloy is characterized by transgranular and along-grain model.

关 键 词：银铜合金 滞后回线 疲劳裂纹 接触线 

分 类 号：TG115.57[金属学及工艺—物理冶金]