冷轧预变形对2519A铝合金时效析出的影响  

Effects of cold-pre-rolling reduction on precipitation of 2519A aluminum alloy plate

作　　者：张新明[1] 贾寓真[1] 刘玲[1] 叶凌英[1] 陈明安[1] 高志国[1] 王文韬[1] 匡小月[1] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2011年第1期46-50,共5页Journal of Central South University:Science and Technology

基　　金：国家重点基础研究发展规划项目(2005CB623706)

摘　　要：采用拉伸性能测试，差示扫描量热法，透射电镜等手段研究不同冷轧预变形量对2519A锚合金时效析出相与力学性能的影响。研究结果表明：淬火后大的冷轧预变形抑制共格相析出，促进半共格相析出：当预变形量从7％增加到40％时，合金峰时效态强度先下降后升高，塑性先下降后略有提高；当预变形为15％～30％时，合金强度下降，这主要由θ’相析出不均匀所致。The effects of cold-pre-rolling reduction on precipitation and mechanical properties of 2519A aluminum alloy plate were investigated by tensile test, differential scanning calorimetry （DSC） and transmission electron microscopy （TEM）. The results show that cold-pre-rolling after quenching promotes the formation of semi-coherent phase θ＇, but suppresses that of coherent phase θ＂ and GP zone. Reduction increasing from 7% to 40% results in peak-age strength decreasing at first, then increasing, and so does elongation. When the reduction is from 15% to 30%, the lost strength can be attributed to the inhomogeneous distribution of θ＇ phase.

关 键 词：2519A铝合金板材 冷轧 预变形 时效析出相 力学性能 

分 类 号：TG166.3[金属学及工艺—热处理]