On the Kinetics of Precipitate Dissolution
On the Kinetics of Precipitate Dissolution
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DOI：
10.1179/030634568790443170
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发表时间：
1968-01
期刊：
影响因子：
--
通讯作者：
H. B. Aaron
中科院分区：
文献类型：
--
作者：
H. B. Aaron
提出了一个沉淀物溶解的模型，该沉淀物最初与其耗尽的基质处于平衡状态。导出的溶解动力学特征为 R(t)=R 0−K√Dt，其中 R(t) 是溶解过程中沉淀物半径或半厚度与时间 (t) 的函数，R0 是溶解开始瞬间的沉淀物半径或半厚度，K 是材料常数，D 是基质中溶质的体积相互扩散系数。预测的溶解动力学的显着特征是，溶解不仅仅是生长的逆转，正如 Thomas 和 Whelan 所断言的那样 (Phil. Mag. 1961, 6, 1103)。此外，他们提出的 R(t) 的时间依赖性与得出的结果不一致。事实证明，溶解实验可以提供一种获得体积互扩散系数近似值的简单方法，该方法特别适合薄膜样品。
A model is presented for the dissolution of a precipitate that is initially in equilibrium with its depleted matrix. The derived dissolution kinetics is characterized by R(t)=R 0−K√Dt, where R(t) is the precipitate radius or half-thickness as a function of time (t) during dissolution, R0 is the precipitate radius or half-thickness at the instant that dissolution begins, K is a material constant, and D is the volume interdiffusion coefficient of the solute in the matrix. The salient feature of the predicted dissolution kinetics is that dissolution is not simply the reverse of growth, as Thomas and Whelan assert (Phil. Mag. 1961, 6, 1103). Furthermore, the time-dependence of R(t) proposed by them is shown to be inconsistent with the results derived. It is demonstrated that dissolution experiments may provide a simple method of obtaining approximate values of volume interdiffusion coefficients that is particularly suited to thin-film specimens.