细晶铝锭制造的6063铝合金时效行为研究  

Ageing Hardening Behavior of 6063 Aluminum Alloys Produced with Grain-refining Aluminum Ingot

作　　者：左秀荣[1] 李立祥[1] 

机构地区：[1]郑州大学物理工程学院

出　　处：《特种铸造及有色合金》2007年第8期631-633,共3页Special Casting & Nonferrous Alloys

基　　金：河南省科技攻关资助项目(0624250012);河南省教育厅自然科学研究资助项目(2007450001)

摘　　要：采用TEM、DSC等试验方法研究细晶铝锭制造的6063铝合金时效行为。得出以下结论：由细晶铝锭制造的6063铝合金200℃时效较好,既可短时间（80min）时效达到较高的时效硬度,又可在较长时效时间内（80-320min）保持高的时效硬度;合金人工时效前存在大量位错缠结,形成胞状结构,促使析出物提前析出,使得合金经200℃×80min时效获得较高的时效硬度;合金经200℃×（80-320）min时效,析出相主要为β″,从而使合金保持较高的时效硬度;合金在30-270℃时效,出现不同类型元素聚集及析出相,导致合金时效硬度发生变化。The ageing behavior of 6063 aluminum alloy produced with grain-refining aluminum ingot has been examined by TEM and DSC. It is found that the 6063 aluminum alloy exhibits better ageing hardening behavior with ageing at 200 ℃, which can not only obtain higher ageing hardness at a short time (about 80 min) , but also remain higher ageing hardness at a longer time (80~320 min). The formation of cell structure and existence of amounts of dislocation tangle resulting in the prior precipitation of precipitates before artificial ageing can be responsible for higher ageing hardness with ageing at 200℃ for 80 min. The remaining higher ageing hardness with ageing at 200℃ for 80~320 min is attributed to the β' precipitate in the alloy. Si/Mg cluster and many kinds of precipitates occur in the alloy aged at 30 and 270℃, resulting in the change of ageing hardness of the alloy.

关 键 词：6063铝合金 细晶铝锭 时效 

分 类 号：TG156.92[金属学及工艺—热处理]