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基于离散格点形式的微扩散方程 ,对失稳区Al Li合金在回归过程中Al3Li(δ′)相溶解做原子层面计算机模拟 ,分析析出相在回归过程中原子图像、序参数的演化 ,进而探讨Al Li合金的回归机制。探明在失稳区Al Li合金的回归过程有序相演化序列为 :化学计量比δ′相→非化学计量比有序相→无序基体。失稳区合金的回归过程为“小范围的成分回落” ,而时效过程为“大范围的成分起伏” ,因此 ,在失稳区合金回归过程并非时效过程的逆过程。
Based on the micro-diffusion equation in the form of discrete lattice points, the Al3Li (δ ’) phase dissolution in the unstable Al Li alloy was simulated by the atomic layer at the atomic level. The evolution of the atomic phase and the sequence parameters of the precipitated phase in the regression process was analyzed. Discussion on the mechanism of Al Li alloy regression. It is proved that the ordered phase evolution sequence of the Al Li alloy in the unstable zone is as follows: stoichiometry δ ’phase → non-stoichiometric phase sequence → disorder matrix. The regression process of the alloy in the zone of instability is “small-scale composition down”, and the aging process is “a wide range of composition fluctuation”. Therefore, the regression process of the alloy in the zone of instability is not the reverse of the aging process.