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
复制标题
关于瓦格纳经典内氧化模型非线性版本的注释
DOI:
--
复制
发表时间:
2011
期刊:
影响因子:
--
通讯作者:
J. Leblond
中科院分区:
文献类型:
--
作者:
J. Leblond
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.