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Linear-parabolic shift of initially sharp interface in AB diffusion couple above the ordering temperature

机译：在有序温度以上，AB扩散偶中初始尖锐界面的线性抛物线位移

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摘要

It is shown that initially sharp interface in AB diffusion couple, above the ordering temperature, can shift with anomalous kinetics, i.e. deviations from the parabolic growth kinetics are possible. The initial slopes of the shift versus time functions can be even unity for large diffusion asymmetry (the ratio of diffusion coefficients of the parent materials in orders of magnitude) and gradually decrease to 0.5 at larger distances (longer times). This is in accordance with earlier results obtained in phase separating systems. It is shown that from the results of simulations the crossover thickness, X*, between the linear and parabolic regimes can also be calculated, and the applicability of the linear-parabolic law is confirmed. Furthermore, it is illustrated that the crossover thickness depends exponentially on the diffusion asymmetry parameter, with the exponent close to the value obtained from analytical estimations.View full textDownload full textKeywordsnon-linear diffusion, anomalous diffusion, nanoscale, interface transfer coefficient, ordering systems, shift of interface, interdiffusionRelated var addthis_config = { ui_cobrand: "Taylor & Francis Online", services_compact: "citeulike,netvibes,twitter,technorati,delicious,linkedin,facebook,stumbleupon,digg,google,more", pubid: "ra-4dff56cd6bb1830b" }; Add to shortlist Link Permalink http://dx.doi.org/10.1080/09500839.2012.687837
机译：结果表明，在有序温度以上，AB扩散偶中最初的尖锐界面会随着异常动力学而移动，即可能会偏离抛物线生长动力学。对于较大的扩散不对称性（母体材料的扩散系数之比，以数量级为单位），位移与时间函数的初始斜率甚至可以统一，并在较大的距离（较长的时间）处逐渐减小到0.5。这与在相分离系统中获得的早期结果一致。从仿真结果可以看出，线性和抛物线型态之间的交叉厚度X *也可以计算出来，并证明了线性抛物线型律的适用性。此外，还说明了交叉厚度与扩散不对称性参数呈指数关系，其指数接近于从分析估计中获得的值。查看全文下载全文关键词非线性扩散，异常扩散，纳米级，界面转移系数，有序系统，接口转换，相互扩散相关var addthis_config = {ui_cobrand：“泰勒和弗朗西斯在线”，servicescompact：“ citeulike，netvibes，twitter，technorati，delicious，linkedin，facebook，stumbleupon，digg，google，更多”，发布：ra-4dff56cd6bb1830b “};添加到候选列表链接永久链接http://dx.doi.org/10.1080/09500839.2012.687837

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