超塑 Al-Li 合金的生产方法是将含(1～5)wt%Li 的 Al-Li 合金锭于400～500℃进行均质热处理,于300～550℃进行热加工,于350～550℃进行一段或二段保温,以高于30℃/h 的冷却速率冷却,再以大于30%或20～60%的轧制量冷却,接着低温软化退火,最后冷却。最好在低温软化退火后,以高于100℃/h 速率加热到350～550℃进行软化处理。用此方法可得到低密度和高塑性的超塑 Al-Li合金,且不会出现断面收缩或局部变形。例如,含(Wt%)2.5Li、2.2Cu、1.1Mg、0.10Fe、0.06 The production method of the superplastic Al-Li alloy is that the Al-Li alloy ingot containing (1~5) wt% Li is homogenously heat-treated at 400~500 ° C., hot-worked at 300~550 ° C., and heated at 350~550 ° C. One or two stages of insulation, cooling at a cooling rate higher than 30 ° C / h, cooling at a rolling amount of more than 30% or 20-60%, followed by softening annealing at a low temperature and finally cooling. Preferably softening treatment is carried out by heating to a temperature of from 350 to 550 ° C at a rate higher than 100 ° C / h after softening annealing at a low temperature. With this method, a low density and high plasticity superplastic Al-Li alloy can be obtained without shrinkage or local deformation. For example, (Wt%) 2.5Li, 2.2Cu, 1.1Mg, 0.10Fe, 0.06