A Note on a Nonlinear Version of Wagner’s Classical Model of Internal Oxidation

A Note on a Nonlinear Version of Wagner’s Classical Model of Internal Oxidation
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关于瓦格纳经典内氧化模型非线性版本的注释

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发表时间:
2011
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通讯作者:
J. Leblond
J. Leblond
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作者:
J. Leblond

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提出了一个非线性版本的瓦格纳的经典模型的内氧化。这个版本占的事实,沉淀物可以作为扩散障碍,通过引入一个启发式依赖的元素的扩散系数后形成的氧化物的局部体积分数。值得注意的是,现在的非线性问题仍然承认一个解析解。这个解决方案揭示了一个突然的和不连续的过渡,从内部氧化形成一些外部氧化规模,当氧化物沉淀物的分数达到一些临界值,可以计算明确的矩阵和氧化物的各自的具体体积。
A nonlinear version of Wagner’s classical model of internal oxidation is presented. This version accounts for the fact that precipitates may act as diffusion barriers by introducing a heuristic dependence of the diffusion coefficients of elements upon the local volume fraction of oxides formed. Remarkably, the now nonlinear problem still admits an analytic solution. This solution reveals a sudden and discontinuous transition from internal oxidation to formation of some external oxidized scale, when the fraction of oxide precipitates reaches some critical value which can be calculated explicitly in terms of the respective specific volumes of the matrix and the oxide.