《厦门大学学报（自然科学版）》

采用相场动力学方法,研究了三元调幅分解型合金扩散偶中的浓度起伏、界面初始浓度差和组元原子迁移率对界面组织演化的影响.研究结果表明,由于扩散偶界面处浓度的突变引起化学势在扩散偶界面处的不连续变化,从而在扩散偶界面附近形成了两相交替排列的周期性片层组织,这种周期性片层组织的片层数随着初始浓度起伏的减小而增加.界面初始浓度差和组元原子迁移率对周期性片层组织的片层数影响较小,但对片层组织的形成时间和粗化过程影响较大.

The phase-field kinetic method was used to study the periodical layered structures formed at the interface of the diffusion couples with spinodal decomposition in ternary alloys.The effects of initial concentration fluctuations,initial concentration difference at the interface and atomic mobilities on the evolution of interfacial structure were systematically investigated.The results indicated that the discontinuity of the chemical potential at the interface,caused by the sharp change in the concentration at the interface,lead to periodical layered structures with alternating phases formed near the interface of the diffusion couple.The number of the periodical layered structures increased with a decrease in the initial concentration fluctuations.The initial concentration difference at the interface and atomic mobilities of the elements had little effect on the number of the periodical layered structures,but had great influence on the formation time and coarsening process of the periodical layered structures.

引言
1 相场模型
2 结果与讨论
3 结论

图1 A-B-C三元系相图及扩散偶成分点<br/>Fig.1 The phase diagram of A-B-C ternary system and the components of diffusion couples

图1 A-B-C三元系相图及扩散偶成分点
Fig.1 The phase diagram of A-B-C ternary system and the components of diffusion couples

图2 在不同的初始浓度起伏下扩散偶中组元B在τ=600时的微观组织模拟图<br/>Fig.2 The simulated microstructures of component B in diffusion couples at τ=600 with different initial concentration fluctuations

图2 在不同的初始浓度起伏下扩散偶中组元B在τ=600时的微观组织模拟图
Fig.2 The simulated microstructures of component B in diffusion couples at τ=600 with different initial concentration fluctuations

图3 不同扩散偶中片层数与初始浓度起伏对数值的关系曲线<br/>Fig.3 The relationships between the number of layers and the logarithms of initial concentration fluctuations in different diffusion couples

图3 不同扩散偶中片层数与初始浓度起伏对数值的关系曲线
Fig.3 The relationships between the number of layers and the logarithms of initial concentration fluctuations in different diffusion couples

图4 不同界面初始浓度差的扩散偶中片层数与时间<br/>的关系曲线(初始浓度起伏ξ*=10-4)<br/>Fig.4 The relationships between the number of layers and time in diffusion couples with different initial concentration differences at the interface(the initial concentration fluctuation ξ*=10-4)

图4 不同界面初始浓度差的扩散偶中片层数与时间
的关系曲线(初始浓度起伏ξ*=10-4)
Fig.4 The relationships between the number of layers and time in diffusion couples with different initial concentration differences at the interface(the initial concentration fluctuation ξ*=10-4)

图5 在不同A原子迁移率的条件下,扩散偶S0/S2中组元B在τ=400和τ=1 400时的微观组织模拟图<br/>Fig.5 The simulated microstructures of component B in diffusion couple S0/S2 at τ=400 and τ=1 400 with different atomic mobilities of element A

图5 在不同A原子迁移率的条件下,扩散偶S0/S2中组元B在τ=400和τ=1 400时的微观组织模拟图
Fig.5 The simulated microstructures of component B in diffusion couple S0/S2 at τ=400 and τ=1 400 with different atomic mobilities of element A

图6 在不同B原子迁移率的条件下,扩散偶S0/S2中组元B在τ=400和τ=1 400时的微观组织模拟图<br/>Fig.6 The simulated microstructures of component B in diffusion couple S0/S2 at τ=400 and τ=1 400 with different atomic mobilities of element B

图6 在不同B原子迁移率的条件下,扩散偶S0/S2中组元B在τ=400和τ=1 400时的微观组织模拟图
Fig.6 The simulated microstructures of component B in diffusion couple S0/S2 at τ=400 and τ=1 400 with different atomic mobilities of element B

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备注

引言

1 相场模型

2 结果与讨论

3 结论

学报简介

备注

引言

1 相场模型

2 结果与讨论

3 结 论

学报简介

3 结论