多向压缩变形对时效态铝铜合金组织和硬度的影响  

Effect of Multi-axial Compression Deformation on Microstructure and Hardness of Aged Al-Cu Alloy

作　　者：屈啸[1] 许晓嫦[1] 陈振湘[1] 张孜昭[1] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083

出　　处：《机械工程材料》2011年第3期64-67,75,共5页Materials For Mechanical Engineering

基　　金：湖南省科技攻关项目(2007FJ3085);湖南省自然科学基金资助项目(05JJ40005)

摘　　要：采用硬度仪、X射线衍射仪及透射电镜等研究了分别含有θ″、θ′和θ析出相三种时效态铝铜合金在室温多向压缩(MAC)过程中硬度和显微组织的变化。结果表明:随着压缩道次的增加,三种时效态合金的硬度基本呈逐渐增加的趋势,但含θ″、θ′相合金的硬度均有一个谷值;多向压缩18道次后,含θ″、θ′相合金获得等轴超细晶粒,尺寸达到0.56～0.71μm,含θ相合金的为细长晶粒,析出相θ不回溶。The changes of hardness and microstructure of three aged Al-Cu alloys contained precipitates θ″、θ′and θ during multi-axial compression （MAC） at room temperature were investigated by hardness tester, X-ray diffraction and transmission electron microscopy. The results show that with the increase of compression pass, the hardness of three aged alloys gradually increased, the hardness values of specimens containing 0＂ and 0＇ phases appeared a valley. The alloys containing θ″ and θ′phases obtained equiaxed ultra-fine grains, whose size was 0. 56- 0. 71μm. And the alloy containing 0 phase obtained slender grains, the precipitates seldom redissoluted.

关 键 词：多向压缩 铝合金 回溶 超细晶粒 

分 类 号：TG146.2[一般工业技术—材料科学与工程]