【摘要】 本文研究了预变形电场时效对１４２０Ａｌ－Ｌｉ合金组织和性能的影响。结果发现，预变形电场时效可以显著提高合金的强度，而塑性降低不大。合金经预拉伸变形３％，在电场强度为４ｋＶ／ｃｍ，１２０°时效１２ｈ后具有最佳的强度和塑性配合。ＴＥＭ分析表明：这一性能结果与预变形电场时效所导致的位错组态、δ′相及其晶界无析出带（ＰＦＺ）的改变有关。更多还原

【Abstract】 The effect of predeformation and aging treatment in an electric field on microstructure and mechanical properties of 1420 AlLi alloy is studied.The result shows that the strength of 1420 AlLi alloy can be greatly improved after the predeformation and aging treatment in an electric field,with the slight decrease of its ductility.The alloy which is subjected to the pretension 3%,and then aged for 12h at 120℃ in an electric field,can obtained the optimized combination of strength and ductility.The observation of TEM indicates:the above result is mainly dependent on the change of the microstructures,such as dislocation,δ′ phase,PFZ,and so on,after the predeformation and aging treatment in an electric field.更多还原