镍铝合金高温氧化的有限元模拟

Finite Element Simulation of High Temperature Oxidation of Nickel Aluminum Alloy

从镍铝合金高温氧化的本质出发,基于扩散反应方程,建立了镍铝合金高温氧化的理论模型。通过有限元方法模拟镍铝合金高温氧化过程,分析镍铝合金发生高温氧化时氧化层的厚度演化规律和氧浓度的分布规律,并研究了初始氧化层厚度对镍铝合金高温氧化的影响。结果表明,镍铝合金高温氧化曲线呈抛物线生长,基本符合氧化动力学规律,并且氧化层厚度随初始氧化层厚度增加而减小。

Starting from the nature of high-temperature oxidation of nickel-aluminum alloy, a theoretical model of hightemperature oxidation of nickel-aluminum alloy was established based on the diffusion reaction equation. The high-temperature oxidation process of nickel-aluminum alloy was simulated by finite element method, and the evolution of the oxide layer thickness and the distribution of oxygen concentration during high-temperature oxidation of nickel-aluminum alloy were analyzed. The effects of initial oxide thickness on the high temperature oxidation of nickel-aluminum alloy were investigated. The results show that the high temperature oxidation of nickel-aluminum alloy shows a parabolic growth, which basically conforms to the oxidation kinetics law, and the thickness of the oxide layer decreases with the increase of the initial oxide layer thickness.