通过力学性能和显微组织检测分析,研究了分级时效工艺对新型Al-Cu-Li合金组织与性能的影响.结果表明:经先高温后低温的双级时效处理和先低温后高温再低温的三级时效工艺处理的合金强度均比T6态的高,但比T8态的稍低;对于先高温后低温的双级时效制度,合金在165 ℃高温时效析出了δ'、θ'、T1相和σ相,然后,在130 ℃二次时效后析出大量细小弥散针状强化相,从而提高了合金的强度;对于先低温后高温再低温的三级时效工艺制度,在150 ℃预时效形成GP区和过渡相,从而在165 ℃时效析出了较多的第二相,经130 ℃的第三级时效后析出了细小的第二相,从而使合金具有较好的综合力学性能.
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