高强Al-Cu-Li-X铝锂合金2A97三级时效工艺及性能研究

Study on Triple Aging and Mechanical Properties of High Strength Al-Cu-Li-X Aluminum Lithium Alloy-2A97

以新型高强A l-Cu-L i-X铝锂合金2A97为研究对象,通过拉伸试验研究两种三级时效工艺及其改型工艺对合金性能的影响。结果表明,含有δ′相二次析出过程的三级时效和含有δ′相回溶过程的三级时效处理合金的强度和塑性达到T6峰值时效水平,三级时效改型工艺由于增加变形使前者合金的强度升高,塑性降低,使后者的强度显著提高。三级时效和单级时效合金的主要显微组织有δ′相、θ″/θ′相和T1相。三级时效改型工艺由于增加变形促进δ′相析出和δ′相回溶,同时变形促进T1相析出,从而改变了主要强化相δ′相和T1相的数量。

The effect of triple aging-T6I6 and RRA and their modified processes on mechanical properties of novel high strength Al-Cu-Li-X aluminum-lithium alloy,2A97,was investigated through tensile test.The results showed that T6I6 and RRA yielded high strength and ductility as the same level as the peak aging,and their modified processes produced highest strength due to introduced plastic deformation.The microstructures consisted of δ′ phase,θ″/θ′ phase and T_1 phase for triple aging and their modified processes.Th...