Al-Li合金回归过程的数值模拟

Computer simulation of Al-Li alloy retrogression

基于离散格点形式的Langevin方程,以Al-12%Li合金为对象,模拟合金完全回归的过程。结果表明,Al-Li合金完全回归过程经过Li的固溶,δ'相的回归,δ'相的无序化;Al-Li合金完全回归,其温度需要达到一定条件才可以发生,否则即使延长回归时间,有序相也只发生部分回归;温度越高,Al-Li合金完全回归时间越短,Li含量越低,发生完全回归的温度越低。

Based on Langevin equation of the discrete format,the evolution of retrogression of Al-12%Li alloy is investigated using computer simulation.The results show that the complete retrogression process of Al-Li alloy as solution of lithium,retrogression of δ′ and disorder of δ′.Al-Li alloy could retrogress completely when the temperature was reached certain conditions,otherwise even prolonged heat treatment time,the ordered phase could partially retrogress.The higher the temperature,the shorter time of Al-Li alloy completely retrogress.The less Li content,the lower temperature of Al-Li alloy completely retrogress.