Retrogression Mechanisms Simulations of Al--Li Alloys

Acta Metall Sin

2004, Vol. 40

Issue (6): 616- DOI:

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Retrogression Mechanisms Simulations of Al--Li Alloys

JIANG Zhihua; WANG Yongxin; CHEN Zheng

Department of Material Science and Engineering; Northwestern PolytechnicalUniversity; Xi' an 710072

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JIANG Zhihua; WANG Yongxin; CHEN Zheng. Retrogression Mechanisms Simulations of Al--Li Alloys. Acta Metall Sin, 2004, 40(6): 616-.

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Abstract 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.

Key words: Al--Li alloy microscopic diffusion equation simulation

Received: 30 June 2003

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