摘要
高温氧化性能是评价热防护材料的一项重要指标,然而由于氧化过程是一个含微结构演化的复杂过程,其定量计算分析一直是研究的难点.基于材料热力学理论,建立了能够考虑微结构演化的相场方法来模拟材料的高温氧化,从而解决了抗氧化性能与氧化生长应力定量计算分析的问题.采用所建立的相场方法,对Fe-Cr-Al-Y合金的高温扩散过程、氧化性能和生长应力演化进行了计算,数值计算结果与文献中的实验结果吻合良好,计算结果还揭示了最大生长应力和外界环境氧浓度之间的线性关系.所发展的相场方法为研究复杂环境下的高温氧化提供了一种有力的计算分析手段.
High-temperature oxidation was an important property to evaluate the thermal protection materials. However, as oxidation was a complex process involving microstructure evolution, its quantitative analysis had always been a challenge issue. A phase field method based on thermodynamics theory was developed to simulate oxidation behavior and oxidation induced growth stress. It involves microstructure evolution, and solves the problem of quantitatively computational analysis for oxidation behavior and growth stress. Employing this method, the diffusion process, oxidation performance and stress evolution were predicted for Fe-Cr-A1-Y alloys. Numerical results agree with experiment data well. The linear relationship between maximum growth stress and the environment oxygen concentration is found. This phase field method provides a powerful tool to investigate high temperature oxidation in complex enviroltment.
出处
《应用数学和力学》
CSCD
北大核心
2011年第6期710-717,共8页
Applied Mathematics and Mechanics
基金
国家自然科学基金资助项目(9050501510702035)
关键词
高温
氧化
相场方法(PFM)
生长应力
high-temperature
oxidation
phase field method（PFM）
growth stress
作者简介
杨帆（198l-），男，吉林人，博士生（E-mail：fan-yang06@mails．tsinghua．edu．cn）
方岱宁，教授（联系人．E-mail．．fangdn@mail．tsinghua．edu．cn）.
