Ni-Al合金中沉淀相Ni3Al相互关系的微观相场模拟

Microscopic Phase-Field Simulation for Correlations of Ni3Al Precipitates in Ni-Al Alloys

摘要:

基于微观相场动力学模型和微观弹性理论，研究了Ni-Al合金中沉淀相Ni3Al(g￠)形貌演化、体积分数以及铝浓度对其相互关系的影响。结果表明，对于所有浓度的合金，沉淀后期，g￠相均沿着[001]和[010]方向规则排列，但是彼此之间存在着不同的相互关系。对于低铝浓度合金，g￠相之间彼此互相独立。对于中铝浓度的合金，g￠相之间主要存在着4种相互关系：L-状，双透镜状，三重组结构和四重组结构。对于高铝浓度的合金，g￠相之间主要呈现双透镜状关系

Abstract:

The effect of Al concentration on the correlations of Ni3Al precipitates (γ′) in Ni-Al alloys was studied based on the microscopic phase-field kinetic model and the microelasticity theory. The simulation results show that γ′ precipitates are arranged along the [001] and [010] directions regarding alloys with all concentration, but there exists different correlations. For the alloy with lower Al concentration, γ′ precipitates are independent each other; for the alloy with medium Al concentration, there are mainly four types correlations among the γ′ precipitates: L-shaped pattern, doublet pattern, triplet pattern and quartet pattern; for the alloy with higher Al concentration, the correlation of γ′ precipitates is mainly doublet pattern