Retrogression Mechanisms Simulations of Al--Li Alloys
Al-Li合金回归机制的计算机模拟

The dissolution kinetics ordered precipitations in a disordered matrix during retrogression heat treatment was investigated on atomic scale using computer simulations based on microscopic diffusion equations (Langevin equation) with the discrete format. The evolutions of atomic pictures and order parameter profiles with time were analyzed, and the retrogression mechanisms of Al--Li alloys were further studied. In the course of retrogression, it is firstly proved that the evolutions phase in a disordered matrix is in the order; and then the retrogression of alloys at metastable field tends to the anti--process of the phase precipitation of alloys at unstable field, while retrogression of alloys at unstable field tend to the anti--process of the phase precipitation of alloys at metastable field.