本文通过对Al-2.2Li-2.5Cu-0.2Mg合金在不同热处理条件下的金相、透射电镜观察以及力学性能测试,研究了其沉淀相变化与性能的关系。结果表明,经525℃(1h)固溶处理时,合金元素得到充分溶解。190℃时效16h合金由单一的T_1相强化,欠时效和过时效(16h)均为两相强化,其效果不如单相强化显著。时效前预变形处理可提高Al-Li合金的塑性而不降低其强度。
The relationship between the microstructures, properties and the phasetransformation in Al-2.2Li-2.5Cu-0.2Mg alloy after various treatments have beenstudied by optical microscopy and TEM observations. It is verified that solutiontreated at 525℃ for 1h is satisfactory for this alloy in which all the alloying ele-menis are dissolved in the α-Al matrix, and aging at 190℃ for 16h is the peak-aged con-dition, the alloy subjected to treatment is strengthened only by T_1 phase. In over-aged or underaged conditions, the alloy are strengthened by two phases, in thesecases, the strengthening effect is smaller than that by one phase. The deformationprlor to aging would develop the plasticity and do not decrease the strength of theexperimenial alloy.
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