企望提高 Al—Zn—Mg 合金的强度,作为合金化添加剂使用了锂,向这些合金中添加锂对时效动力学产生了影响,在高温和长时间时效方面提高了硬度和强度的最大值,这就造成了用锂合金化的合金在200℃长时间加热的条件下具有相当高的强度性能,以而引起实际上的注意,在外国的文献中也提到了向变形可焊铝合金成分中加锂的问题。在文献中没有报道 Al—Zn—Mg—Li The desire to increase the strength of Al-Zn-Mg alloys, the use of lithium as an alloying additive, the effect of adding lithium to these alloys on the kinetics of aging and the increase in hardness and strength maxima at elevated temperatures and prolonged aging Resulting in a lithium alloying alloy at 200 ℃ for a long time under the conditions of heating has a very high strength properties, which led to the actual attention in the foreign literature also referred to the deformation of the weldable aluminum alloy composition plus Lithium problem. Al-Zn-Mg-Li is not reported in the literature