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本文介绍了我们研究室近年来关于认识和解决干扰Al—Li合金发展的难题的研究情况及其结果。此外,确定了所发展的新Al—Li合金的性能指标:(a)弹性模量/比重之比值比7075—T76合金提高30％,而其他性能与7075—T76接近;(b)弹性模量/比重之比值,强度/比重之比值,都比7075—T76提高20％,而其他性能与7075—T76接近。采取了两种工艺方法:一种是常规铸锭冶金法(I/M);另一种是把快速冷凝的细粉粒压实的粉末冶金法(P/M)。采用快速冷凝法是为了减少或完全避免成分偏析,减小品粒尺寸,提高合金元素的固溶程度和细化弥散粒子。对两种方法制成的相似的合金的组织和性能作了一些比较。
This article describes the research and results of our laboratory in recent years on understanding and solving the problems that interfere with the development of Al-Li alloys. In addition, the performance specifications of the new Al-Li alloys developed were determined: (a) the modulus of elasticity / specific gravity ratio increased by 30% over that of the 7075-T76 alloy while other properties were similar to those of the 7075-T76; (b) the modulus of elasticity / Proportion of the ratio, the ratio of strength / proportion, than the 7075-T76 increased by 20%, while other properties and 7075-T76 close. Two processes have been adopted: one is conventional ingot metallurgy (I / M); the other is powder metallurgy (P / M) which compacts rapidly condensed fine particles. The use of rapid condensation method is to reduce or completely avoid component segregation, reducing particle size, increase the degree of solid solution alloying elements and refine the dispersed particles. A comparison is made between the microstructure and properties of similar alloys made by the two methods.