Precipitation kinetics of 2519A aluminum alloy based on aging curves and DSC analysis  

基于时效曲线和DSC分析的2519A铝合金析出动力学(英文)

作　　者：吴懿萍[1] 叶凌英[1] 贾寓真 刘玲 张新明[1] 

机构地区：[1]中南大学 材料科学与工程学院,长沙410083 [2]湖南泰嘉新材料科技股份有限公司,长沙410200 [3]参数技术公司,上海200120

出　　处：《Transactions of Nonferrous Metals Society of China》2014年第10期3076-3083,共8页中国有色金属学报（英文版）

基　　金：Project(2012CB619500)supported by the National Basic Research Program of China

摘　　要：The precipitation kinetics of 2519 A aluminum alloy after different cold rolling reductions before aging was investigated by hardness test and differential scanning calorimetry（DSC）. The activation energy was calculated according to DSC curves using single heating rate method. The microstructures of as-rolled and peak-aged alloys were observed by transmission electron microscopy（TEM）. The result shows that the age hardenability reduces and the activation energy rises with increasing the reduction from 7% to 40%. Nonuniform dislocations are found in as-rolled alloy and inhomogeneous distribution of θ′ phase is revealed in peak-aged alloy when the reduction is 15%. The inhomogeneous distribution of θ′ phase may be related to the age hardenability reducing and activation energy rising.采用硬度测试和差示扫描量热法研究时效前不同冷轧变形量对2519A铝合金析出动力学的影响。根据DSC曲线,采用单升温速率法计算合金的激活能;采用透射电子显微镜观察冷轧和峰时效状态下合金的微观组织。结果表明:随着冷轧变形量从7%增加至40%,合金的时效硬化能力降低,激活能升高。当冷轧变形量为15%时,在冷轧态合金组织中观察到密度不均匀的位错组织,在峰时效状态合金组织中观察到不均匀分布的θ′相。不均匀分布的θ′相可能是造成合金时效硬化能力降低和激活能升高的原因。

关 键 词：2519A aluminum alloy dislocation structure precipitation kinetics θ′ phase differential scanning calorimetry（DSC） 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG339[金属学及工艺—金属材料]