6082铝合金的淬火特性及微观组织  

Quenching Characteristics and Microstructure of 6082 Aluminum Alloy

作　　者：龙社明 王孟君[1] 温柳[1] 梁岩[1] 陈欣怡[1] Long Sheming Wang Mengjun Wen Liu Liang Yan Chen Xinyi(The Key Laboratory of Nonferrous Metal Materials Science and Engineering of Ministry of Education, Central South University, Changsha 410083, China)

机构地区：[1]中南大学有色金属材料科学与工程教育部重点实验室,湖南长沙410083

出　　处：《稀有金属材料与工程》2017年第9期2553-2557,共5页Rare Metal Materials and Engineering

基　　金：广东省重大科技专项(2009 A080205003)

摘　　要：采用末端淬火和中断淬火方式,结合透射电镜(TEM),研究了6082铝合金的淬火特性及微观组织变化特征。结果表明:在末端淬火试验条件下,6082铝合金的淬透深度为15~20 mm;淬火敏感区间的平均冷却速率达20℃/s时,合金时效后形成细小弥散的β″相,无沉淀析出带(PFZ)窄小。在中断淬火的高温保温过程中,几乎没有β平衡相的析出,时效后获得了较高的硬度;在中温保温过程中,β平衡相因消耗周围的溶质原子而快速形成并长大,导致时效后合金性能大幅度下降;低温保温过程中,β平衡相形成缓慢,随时间增加,析出数量增多并长大,影响后续时效强化效果。合金在慢冷和保温过程中,析出的β平衡相大多是以富铁相颗粒作为不均匀形核的核心,这是造成合金淬火敏感性高的原因之一。The microstructure and quenching characteristics of 6082 aluminum alloy were investigated via an end quenching test,an interrupted quenching method and transmission electron microscopy（TEM）. The result shows that the hardenability depth of 6082 aluminum alloy is 15~20 mm under the condition of end quenching. When the cooling rate is 20 °C/s,plenty of fine and dispersed β″ are formed after artificial aging,and the precipitation free zone is narrow. By the interrupted quenching method,when the alloys are preserved at high temperature,the precipitation of β-equilibrium phase is not obvious which retains high saturated solid solution and has small effect on aging; while in the isothermal process of medium temperature,β-equilibrium phases are formed and grow up quickly by the consumption of solute atoms nearby which makes a great contribution to properties loss; when the alloys are preserved at low temperature,quenching induced precipitates are formed slowly but grow up with the extension of time. No matter in slow cooling or isothermal process,quenching induced precipitates β is prior to nucleate on the（AlFeSi） dispersoids,which is one of the reasons for the high quench sensitivity of the alloy.

关 键 词：6082铝合金 淬火 微观组织 无沉淀析出带 β平衡相 

分 类 号：TG146.21[一般工业技术—材料科学与工程]