时效成形对2324铝合金组织及性能的影响

Effect of Age-forming on Microstructures and Properties of 2324 Al Alloy

研究了时效成形对2324铝合金力学性能的影响,利用透射电镜观察了时效成形过程中的微观组织。研究了时效成形产生的"应力位向效应"及其对力学性能的影响,对"应力位向效应"的特征和产生原因进行了分析。结果表明:由于外加应力造成了平行应力方向和垂直应力方向扩散系数的差异,导致析出相择优生长。无应力时效时析出相沿{201}晶面族均匀析出,时效成形过程中析出相沿平行(111)方向择优生长,择优生长方向主要取决于外加应力的方向。

The effect of age-forming on the mechanical properties of 2324 Al alloy The microstructure evolution during age-forming was observed with TEM. The ＂ was investigated. stress orientation effect＂ of age-forming and its effect on the mechanical properties were studied. The characteristics and the reason of the ＂stress orientation effect＂ were analyzed. The results demonstrate that due to the difference of the diffusion coefficients between in the parallel stress direction and vertical stress direction, the precipitates grow preferentially parallel to （11^-1） during age-forming while grow uniformly along {201} under stress free ageing, which is the typical ＂stress orientation effect＂. The preferential orientation is mainly decided by the direction of the external stress.