摘要
在应力作用下对带有涂层的高强度铝合金构件在3.5% NaCl溶液中腐蚀疲劳断口进行了研究。结果表明:在腐蚀条件下高强度铝合金构件断口上不仅出现疲劳辉纹,还出现准解理、解理、沿晶等断裂特征,腐蚀疲劳过程属于阳极溶解机制控制。失效形式为多裂纹断裂,在各个铆孔处均有裂纹萌生,其中有一处为主裂纹,其位置不固定,主裂纹扩展距离较长,最后与其它裂纹汇合,最终导致疲劳断裂。
The fractography of high strength aluminum alloy LY12CZ riveted specimen with coating was investigated after corrosion fatigue tests under stress in 3.5% NaCl solution. Fracture features like fatigue striation, dimple, cleavage, and intergranular fracture were observed. The corrosion fatigue mechanism was controlled by anodic dissolution. The failure mode was multi-crack fracture. Cracks were initiated from every rivet holes. The principal crack with longer propagation length and varying positions finally converged with other cracks and led to fatigue fracture.
出处
《中国腐蚀与防护学报》
CAS
CSCD
北大核心
2008年第1期48-52,共5页
Journal of Chinese Society For Corrosion and Protection
基金
辽宁省教育厅科学研究计划资助(20040235)
关键词
铝合金
构件
腐蚀疲劳
失效
aluminum alloy, specimen, corrosion fatigue, failure
