Synthesis Processing of High-Lithium Al-Li Alloys

摘要

The goal of this research project is to determine the feasibility of producing Al-Li-base alloys suitable for structural applications with densities in the range 2.2 to 2.4 Mg/m3. Alloys belonging to two broad categories have been studied thus far: Al-Li-Mg alloys and Al-Li-(Y,Sb) alloys. The alloy compositions were selected to avoid formation of the AlLi phase which has deleterious effects on mechanical and electrochemical properties when a substantial volume fraction is present. Rapid solidification has been used to retain a fine microstructure, since all of the alloys exceeded the solubility limit. Splat-quenched flakes of several compositions within each category have been studied, both as-quenched and after an annealing treatment designed to simulate hot vacuum degassing. After annealing, the Al-Li-Mg alloys contained the Al2LiMg phase in equilibrium with an Al matrix. Rapid solidification, Aluminum, Lithium, Ytterbium. (JES)