Effect of copper on precipitation and baking hardening behavior of Al-Mg-Si alloys  

Cu含量对Al-Mg-Si合金析出及烤漆硬化行为的影响(英文)

作　　者：刘璁慧 张新明[1] 唐建国[1] 刘星兴[1] 陈亮[1] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083

出　　处：《Transactions of Nonferrous Metals Society of China》2014年第7期2289-2294,共6页中国有色金属学报（英文版）

基　　金：Project(51105139)supported by the National Natural Science Foundation of China;Project(2010CB731706)supported by the National Basic Research Program of China

摘　　要：The effects of copper on the ageing precipitation behavior of as-quenched and pre-aged AA6016 aluminum alloy were studied by differential scanning calorimetry （DSC）, Vickers hardness measurement and transmission electronic microscopy （TEM）. The results indicate that the addition of copper facilitates the growth of clusters （GP I） to the critical size during pre-ageing. Therefore, the addition of copper accelerates the transition from GP I （pre-β＂） to GP II （β＂） during final artificial ageing, and finally results in the favorable paint-bake response. However, the one with the copper level of 0.3% does not show significant baking hardening response as expected. Pre-aging can also reduce the detrimental effect due to natural aging of copper-containing alloys.采用DSC、硬度测试及TEM研究Al6016铝合金中Cu含量对淬火及淬火预时效样品的人工时效析出和硬化行为的影响。结果表明,微量Cu有利于形成较大且稳定性较好的GP I,能在随后的人工时效过程中进一步向GP II转化,从而提高合金的烤漆硬化能力。但是,当Cu含量为0.3%时,烤漆硬化能力没有得到显著增加。对于含Cu合金,预时效热处理也能有效地抑制合金的自然时效行为。

关 键 词：Al-Mg-Si-Cu alloy baking hardening behavior Cu contained precipitates 

分 类 号：TG146.21[一般工业技术—材料科学与工程]