织构对含铒铝合金疲劳裂纹扩展行为的影响  

Infl uence of Texture on Fatigue Crack Propagation of Ercontaining Aluminum Alloy

作　　者：雷欣[1] 聂祚仁[1] 黄晖[1] 文胜平[1] 

机构地区：[1]北京工业大学材料科学与工程学院,北京100124

出　　处：《机械工程材料》2015年第6期11-15,78,共6页Materials For Mechanical Engineering

基　　金：国家重点基础研究发展计划(973)项目(2012CB619503)

摘　　要：对含铒铝合金板材进行不同工艺的轧制及热处理,得到了具有不同织构的铝合金板材,再通过中心裂纹板材的高周疲劳试验,研究了织构对合金疲劳裂纹扩展的影响。结果表明:合金板材中织构的含量与板材轧制变形量及退火温度有关;板材中疲劳裂纹总是倾向于沿Schmid因子较大的方向扩展;板材中织构越多,则晶粒间取向差角越小,疲劳裂纹偏折越小,裂纹扩展路径越短,疲劳裂纹扩展速率越快;板材中织构越少,晶粒间取向差角越大,疲劳裂纹偏折越厉害,裂纹扩展路径越长,疲劳裂纹扩展速率降低。Through different processes of rolling and heating treatment, the Er-containing Al alloy plates contained different types of textures were obtained. The effects of textures on the fatigue crack growth of the Al alloy plates were investigated through the high cycle fatigue test for center crack plate. The results show that the contents of textures were related to rolling deformation and annealing temperature. The fatigue crack tended to propagate along the path with large Schmid factor. The more textures the plate had, the smaller the misorientation angles between grains and the defl ection of cracks became, the shorter the fatigue crack propagation path was, and the faster the fatigue crack propagation rate was. The less textures the plate had, the larger the misorientation angles between grains and the deflection of cracks became, the longer the fatigue crack propagation path was, and the lower the fatigue crack propagation rate was.

关 键 词：疲劳裂纹扩展 含铒铝合金 织构 

分 类 号：TG14[一般工业技术—材料科学与工程] TG111.8[金属学及工艺—金属材料]