TA1/6061铝合金双金属热变形行为及热加工图

Hot deformation behavior and hot processing map of TA1/6061 aluminum alloy bimetal

以TA1/6061铝合金双金属为研究对象,采用Gleebe-3800热模拟试验机,在变形温度为350~500℃、应变速率为0.01~1 s^(-1)、变形量为40%的条件下进行了单向热压缩复合试验,研究了TA1/6061铝合金双金属的热变形行为,建立了TA1/6061铝合金双金属本构方程及热加工图。结果表明,TA1/6061铝合金双金属热变形过程中的流变应力随着温度的上升和应变速率的降低而减小;基于试验数据建立的Arrhenius本构方程可以有效预测特定真应变下的真应力,其相关性系数为0.99642,热变形激活能为231434 J·mol-1;基于热加工图、SEM图像和EDS线扫描图像,确定最优热加工工艺窗口为:变形温度为482~500℃,应变速率为0.011~0.192 s^(-1)。

Taking the TA1/6061 aluminum alloy bimetal as the research object,the hot deformation behavior of TA1/6061 aluminum alloy bimetal was studied using Gleebe-3800 thermal simulator under the conditions of deformation temperature of 350-500℃,strain rate of 0.01-1 s^(-1) and deformation amount of 40%.The constitutive equation and hot processing maps of TA1/6061 aluminum alloy bimetal were established.The results show that the flow stress of TA1/6061 aluminum alloy bimetal decreases with the increase of temperature and the decrease of strain rate during hot deformation.The Arrhenius constitutive equation established based on test data can effectively predict the true stress under specific true strain,with the correlation coefficient of 0.99642 and thermal deformation activation energy of 231434 J·mol-1.Base on the hot processing maps,SEM diagrams and EDS line scanning images,the optimal thermal processing process window is determined as follows:deformation temperature is 482-500℃and strain rate is 0.011-0.192 s^(-1).