6061铝合金的淬火敏感性研究  

Investigation on quenching sensitivity of 6061 aluminum alloy

作　　者：温柳[1] 王孟君[1] 高萌[1] 杨刚[1] 程轩[1] 葛鹏[1] 

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：《材料热处理学报》2014年第1期94-97,共4页Transactions of Materials and Heat Treatment

基　　金：广东省重大科技专项(2009A080205003)

摘　　要：采用中断淬火／时效处理获得时间-温度-性能（TTP）曲线，结合透射电镜（TEM）微观组织研究了6061铝合金的淬火敏感性。结果表明，6061铝合金TTP曲线的鼻尖温度约为340oC，中温区（230～445℃）淬火敏感性较高，而高、低温区淬火敏感性较低。合金在鼻尖温度保温过程中，粗大平衡相依附于富铁相（AlFeSi）粒子不均匀形核析出，减小了基体中溶质原子溶度，削弱了后续时效强化效果。适当提高淬火敏感区的冷却速率和降低高、低温区的冷却速率，这既可保证合金较佳的力学性能，又减小淬火应力。Quenching sensitivity and microstructure of 6061 aluminum alloy were studied by time-temperature-properties （TTP） curves obtained by means of isothermal quenching and transmission electron microscopy（TEM）. The results show that the alloy exhibits high quenching sensitivity at 230 -445 ℃ with the nose temperature of 340 ℃ in TTP curves, but lower quenching sensitivity is observed in the high temperature zone and low temperature zone. Holding at the nose temperature, large equilibrium phases are formed on iron-rich phase particles （A1FeSi） by heterogeneous nucleation, which leads to the decrease of solutes in matrix and weakening of subsequent aging hardening effect. The increasing of cooling rate in quenching sensitivity zone and decreasing cooling rate in high and low temperature zone are beneficial to improving mechanical property and decreasing residual stress of the 6061 aluminum alloy.

关 键 词：6061铝合金 时间-温度-性能曲线 淬火敏感性 微观组织 

分 类 号：TG146.2[一般工业技术—材料科学与工程]