6156-T62铝合金的高周疲劳性能研究  

High Cycle Fatigue Performance of 6156-T62 Aluminum Alloy

作　　者：佘玲娟[1] 郑子樵[1] 钟申[1] 吴秋萍[2] 李红萍[2] 

机构地区：[1]中南大学,湖南长沙410083 [2]中国商飞上海飞机设计研究院,上海200232

出　　处：《稀有金属材料与工程》2012年第7期1201-1205,共5页Rare Metal Materials and Engineering

基　　金：国家重点基础研究发展规划(2005CB623705)

摘　　要：研究了不同取样方向和应力集中系数(Kt)条件下6156铝合金的高周疲劳性能,并利用金相、透射和扫描电镜对合金的显微组织及断口进行了观察。结果表明,在同一应力水平条件下,取样方向对光滑试样和缺口试样的疲劳寿命影响甚微。光滑试样(Kt=1)的疲劳寿命大于缺口试样(Kt=3)的疲劳寿命,表明此合金有明显的缺口效应。第二相粒子在疲劳裂纹萌生过程中起关键作用,绝大部分裂纹都是在表面粗大粒子上或粒子/基体界面上萌生。The high cycle fatigue of 6156 aluminum alloy was investigated under the conditions of different orientations and stress concentration factor. In addition, the microstructures and the fatigue fracture surfaces of the alloy were examined by optical, transmission and scanning electron microscopy. The results show that the effect of different orientations on the fatigue life of 6156 aluminum alloy is rather little and the fatigue life of Kt=l is longer than that ofKt = 3, exhibiting notch sensitivity. The second phase particles play a key role during fatigue crack initiation, and most part of the cracks originate from the coarse particles on the surface or from the interface between the second phase particles and matrix.

关 键 词：疲劳寿命 应力集中系数 应力比 第二相粒子 

分 类 号：TG115.57[金属学及工艺—物理冶金] TG146.21[金属学及工艺—金属学]