铝-锂合金具有低的密度、高的弹性模量和强度,是一类大有发展前途的正在试用的航空航天材料。但是以纯金属锂的形式熔炼铝-锂合金时,一则要求锂很纯,有害杂质特别是钠的含量应很低,二则锂是一种化学活性很高的元素,给生产与保管带来很大困难。如以铝-锂中间合金或铝-铜-锂三元中间合金的形式添加锂,则就方便得多了。 Aluminum-lithium alloys, with their low density, high modulus of elasticity and strength, are a promising group of aerospace materials under test. However, in the form of pure lithium metal smelting aluminum - lithium alloy, one requires lithium is pure, harmful impurities, especially sodium content should be very low, two lithium is a highly chemically active element, bringing to the production and storage Very difficult. It is much more convenient to add lithium in the form of an aluminum-lithium intermediate alloy or an aluminum-copper-lithium ternary master alloy.