2091铝锂合金变形断裂过程的原位观察  

IN SITU OBSERVATION OF DEFORMATION AND FRACTURE IN 2091 Al Li ALLOY

作　　者：陈小群[1] 尹志民[1] 

机构地区：[1]中南工业大学测试中心 材料科学与工程系

出　　处：《中国有色金属学报》1996年第3期155-157,共3页The Chinese Journal of Nonferrous Metals

摘　　要：利用透射电镜对２０９１铝锂合金在不同热处理状态下的变形断裂过程进行了原位观察，结果表明，在不同的时效状态，合金的应变局部化不同，在近峰值时效合金变形时，位错切割δ′相而产生强的共面滑移，引起应变不均匀；而在过时效态合金中，应变集中于晶界ＰＦＺ内。The processes of deformation and fracture in a 2091 Al Li alloy under various heat treatment conditions were investigated in situ by transmission electron microscopy. In near peak aged alloy, the shearable nature of the δ′ precipitates tends to localize the strain in intense deformation bands. On the other hand, in over aged alloy, the presence of wide PFZs with copious grain boundary precipitates stimulates localized deformation in the PFZs, and the planar slip bands are obviously weakened.

关 键 词：铝锂合金 变形 断裂机制 原位观察 

分 类 号：TG146.21[一般工业技术—材料科学与工程]