强变形诱导析出相回溶对Al-Cu合金热稳定性的影响  

Effect of dissolution of precipitated phases on thermal stability of Al-Cu alloy after severe plastic deformation

作　　者：张孜昭[1] 许晓嫦[1,2] 夏卿坤[1,3] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]中南大学有色金属材料科学与工程教育部重点实验室,长沙410083 [3]长沙大学机电工程学院,湖南长沙410003

出　　处：《材料热处理学报》2010年第8期85-90,共6页Transactions of Materials and Heat Treatment

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

摘　　要：采用硬度检测、透射电镜观察、选区电子衍射等方法,研究了Al-Cu合金固溶态、含θ′相和含θ相的试样在强变形诱导析出相低温回溶后的加热退火过程中晶粒尺寸、高角晶界百分比及组织结构和硬度的变化。试验结果显示:当退火温度低于150℃时,Al-Cu合金三种状态的试样其晶粒尺寸与高角晶界的百分数基本上没有变化;加热温度至200℃以上后,晶粒尺寸、高角晶界百分比开始增加;加热至250℃时,固溶态试样的晶粒尺寸长大至100μm左右,含析出相的试样晶粒尺寸保持在10.0～15.0μm。在250℃退火50min后,固溶态试样的硬度值一直低于含θ′、θ析出相试样的硬度值。The evolution of hardness,grain size and fraction of high angle grain boundaries with annealing temperature in Al-Cu alloy after severe plastic deformation was investigated by means of hardness measurements,transmission electron microscopy with selected area electron diffraction.It was found that no significant chang of grain size and fraction of high angle grain boundaries of the severely deformed specimens with different initial microstructure was observed when annealed at temperature lower than 150 ℃ .The grain size and fraction of high angle grain boundaries of the specimens annealed at 200 ℃ begin to increase.The grain size of the severely deformed alloy with initial microstructure of solid solution after annealing at 250 ℃ for 1 h grows to about 100 μm and that of the alloy containing θ′and θ precipitates is 10.0 μm to 15.0 μm.The hardness of the sample with initial microsturcture of solid solution is lower than that of the samples containing θ′and θ precipitates after annealing treatment at 250℃ for 50 minutes.

关 键 词：AL-CU合金 强塑性变形 析出相回溶 热稳定性 

分 类 号：TG146.2[一般工业技术—材料科学与工程]