6061铝合金时效工艺和动力学模型研究  

Study on the aging process and dynamics model fitting of 6061 aluminum alloy

作　　者：易杰[1,2] 蒋斌[2,3] 

机构地区：[1]湖南工业职业技术学院,湖南长沙410208 [2]湖南大学汽车车身先进设计制造国家重点实验室,湖南长沙410082 [3]长沙仲腾金属材料科技有限公司,湖南长沙410081

出　　处：《轻合金加工技术》2014年第7期30-36,共7页Light Alloy Fabrication Technology

基　　金：国家自然科学基金面上资助项目(51075132);湖南省科技计划项目(2013GK3050)

摘　　要：采用硬度测试、拉伸试验、TEM分析等手段,系统研究了不同时效温度和时间对6061铝合金型材力学性能的影响,并拟合了6061铝合金的时效动力学模型。结果表明,6061铝合金硬度到达到时效峰值的时间随时效温度的升高而缩短,并且硬度峰值随温度升高而降低;时效工艺为180℃9 h时,合金的硬度、屈服强度和抗拉强度达到峰值。结合TEM分析得知,合金的析出强化相为针状β″相;通过回归分析,在Johnson-Mehl-Avrami(JMA)方程的基础上建立了6061铝合金的时效动力学模型。The effects of homogenization temperature and holding time on the mechanical properties of 6061 aluminum alloy profiles were investigated by hardness test,TEM and Tensile test,and the ageing dynamics model of 6061 aluminum alloy is fitted. The results show that ,with the ageing temperature increasing ,the time of 6061 aluminum alloy hardness achieving the peak will decrease while the peak hardness reduce; The maximum hardness and strength of 6061 aluminum alloy can be achieved by being aged at 180℃ for 9h. The needleshaped β″ precipitates were observed in the aged alloy with peak hardness by TEM analysis. Moreover, on the basis of Johnson-Mehl-Avrami equation（JMA） , a dynamic ageing model of 6061 aluminum alloy has been derived by regression analysis.

关 键 词：6061铝合金 硬度 JMA方程 时效动力学模型 

分 类 号：TG156.92[金属学及工艺—热处理] TG146.21[金属学及工艺—金属学]