【摘要】 通过常温拉伸试验和TEM观察,研究了时效处理工艺对新型Al-Cu-Li合金微观组织和力学性能的影响。结果表明,时效温度和时效时间对Al-Cu-Li合金的组织性能均产生较大的影响,其中时效温度的影响更为明显。时效前的预变形可促进T1相非均匀形核,使T1相细化,加强T1相对合金的沉淀强化效果,阻止σ相的形成,改善合金的组织,使合金的力学性能得到显著提高。该合金T6态最佳时效制度为:520℃×2 h+165℃×48 h;T8态最佳时效制度为:520℃×2 h+(4%~6%)预变形+135℃×48 h。更多还原

【Abstract】 By means of room-temperature tensile test and TEM,effects of aging process on microstructures and mechanical properties of a new-type Al-Cu-Li alloy were investigated.The results show that effects of aging temperature and aging time on microstructures and mechanical properties of the Al-Cu-Li alloy are strong,but effects of aging temperature are stronger.Predeforming before aging promotes the heterogeneous nucleation of T1 precipitates throughout the matrix,refines the T1 phase,increases the aging strengthening effect,improves the microstructures and hence increases the mechanical properties significantly.As a result,the favorable aging process for this alloy is that aging at 165 ℃ for 48 h,and the favorable strain-aging process is that predeforming(4%～6%) before aging+aging at 135 ℃ for 48 h.更多还原