摘要
本文采用拉伸实验和透射电镜法,研究了2014铝合金的回归再时效(RRA)处理.结果表明:采用欠时效(100℃(2×2h)与适当回归处理(200×5min)配合的RRA处理,可同时提高2014合金的强度和塑性.适当的回归处理能使欠时效2014合金组织中部分GP区优先长大.随后再进行峰时效处理,不仅能改善晶界析出相的尺寸和分布,而且还能使基体析出相尺寸产生明显的差异.这种尺寸有明显差异的基体析出相协同强化有利于提高2014合金的强韧性.
Effect of retrogression and reaging treatments on the microstructure and tensile properties of 2014 aluminium alloy has been investigated by means of tensile test and transmission electron microscope. The results show that the strength and plasticity of 2014 alloy can be improved simultaneously by retrogression and reaging treatments which should include a proper match of underaging (100℃×2h) and retrogressing (200℃× 5min). Some of GP zones in 2014 alloy can preferentially grow up and its intergranular structures can be improved during proper retrogression treatment. For 2014 alloy on this condition, matrix precipitates with obviously different size can be obtained by following T6 treatment. This cooperative strengthening with matrix precipitates with obviously different size is advantageous to the improvement of the strength and plasticity of 2014 alloy.
出处
《材料与冶金学报》
CAS
2003年第3期210-215,共6页
Journal of Materials and Metallurgy
基金
国家重点基础研究发展规划项目(G1999064900-9-4)
