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研究了回归及回归再时效处理对7B04铝合金预拉伸厚板的显微组织、力学性能及电导率的影响.通过透射电子显微镜(TEM)观察了回归再时效合金的微观组织,并对合金进行了力学性能及电导率测试.结果表明:采用合适的回归再时效工艺(180℃/1h,水淬+120℃/22h)可使材料具有接近T6态合金强度的同时,电导率大幅度提升,达21.0MS.m-1;此时,合金晶内组织与T6状态相似,析出相细小呈弥散分布,而晶界组织与双级T74时效组织特征相似,晶界析出相粗大呈不连续分布,晶界两侧伴之以明显的晶界无析出带.
The effects of regression and re-aging treatment on the microstructure, mechanical properties and electrical conductivity of 7B04 aluminum alloy pre-stretched plate were investigated.The microstructure of the re-aged alloy was observed by transmission electron microscopy (TEM) The mechanical properties and electrical conductivity were tested.The results show that the electrical conductivity can be greatly improved by adopting the appropriate regressive re-aging process (180 ℃ / 1h, water quenching + 120 ℃ / 22h) , Up to 21.0MS.m-1; At this time, the intragranular structure of the alloy is similar to that of T6, and the precipitated phase is finely dispersed, while the grain boundary structure is similar to that of the two-stage T74 aging structure. , Both sides of the grain boundary accompanied by a clear grain boundary precipitation zone.