Y 对8090Al-Li 合金拉伸性能和断裂行为的影响  

EFFECT OF Y ON TENSILE PROPERTIES AND FRACTURE BEHAVIOR OF 8090 Al-Li ALLOY

作　　者：桂全红 马禄铭[1] 蒋晓军[1] 梁国军[1] 李依依 

机构地区：[1]中国科学院金属研究所

出　　处：《材料科学进展》1993年第5期396-400,共5页

基　　金：国家自然科学基金;59071019

摘　　要：研究了两种不同 Y 含量对8090Al-Li 合金拉伸性能及断裂行为的影响。实验表明:加入0.1wt-%Y 可在不降低强度的情况下提高合金的塑性,加入0.5wt-%Y 可在不降低塑性的情况下提高合金的强度。在峰值时效条件下,不加 Y 的合金断裂为穿晶韧窝型和沿晶塑性混合方式,并伴有沿晶二次裂纹,加0.1%Y 不改变合金断裂模式,但使沿晶成分减少;加0.5%Y 合金则发生快速剪切断裂。本文从晶粒结构角度对断裂行为提出了解释。The effect of various content(0.1 and 0.5 wt-%)of rare earth element Y on ten-sile properties and fracture behavior of 8090 Al-Li alloy has been studied.The results show thathigher ductility can be obtainted by 0.1% Y addition and the strength does not reduce;higherstrength can be obtained by 0.5% Y addition and the ductility does not reduce.In peak agedcondition,the alloy with Y-free or 0.1% Y shows mixture fracture mode of ductileintergranular and transgranular with dimples.When 0.5% Y is added,the fracture of alloymakes a feature of shear-type transgranular.The relation between grain structure and fracturebehavior has also been discussed in this paper.

关 键 词：合金 拉伸性能 断裂 铝 锂 稀土族 

分 类 号：TG146.21[一般工业技术—材料科学与工程]