固溶时效对Al-4.6Cu-0.9Li合金组织与拉伸性能的影响

通过组织分析和常温拉伸性能测试,研究了固溶时效对Al-4. 6Cu-0. 9Li合金组织与拉伸性能的影响。结果表明,经520℃固溶处理0. 5 h后,试验合金冷轧板材中Al₇Cu₄Li和Al₂CuLi相均固溶充分,仅剩下少量难溶的Al7Cu2Fe相;时效前引入预变形后可明显缩短试验合金到达峰值态的时间,且大幅提高时效态合金的强度值;主要归因于时效前的预变形处理引入的大量位错为大量细小弥散分布的T₁相快速析出提供了非均匀形核区域。此外,由于预变形量为6%时,合金中的主要强化相为T₁和θ’相共同析出,不同类型析出相对多系滑移的有效阻碍使合金达到了强塑性的综合性能提高。 

Effects of solution and aging on microstructure and tensile properties of Al-4. 6Cu-0. 9Li alloy

The effects of solution and aging on microstructure and tensile properties of Al-4. 6Cu-0. 9Li alloy were studied by means of microstructure analysis and tensile test at room temperature. The results show that both Al7Cu4Li and Al2CuLi in the cold rolled sheet of the experimental alloy are fully dissolved,leaving only a few insoluble Al7Cu2Fe phase,after solid solution treatment at 520 ℃ for 0. 5 h. The pre-deformation can obviously shorten the time of the experimental alloy to reach the peak-aging state,and greatly increase the strength of the aging alloy,which can be mainly attribute to the large number of dislocations introduced before aging,providing a preferential nucleation sites for the rapid precipitation of fine dispersed T1 phase. In addition,the main strengthening phase T1 and θ’ is precipitated together in the alloy by 6% pre-deformation. Thus the moving of multiple slip system is hindered by different types of phases,and the comprehensive properties of the alloy is improved.