Solutal gradients in strained equilibrium
Solutal gradients in strained equilibrium
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DOI：
10.1080/09500839.2013.847288
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发表时间：
2013-12-01
影响因子：
1.2
通讯作者：
Steinbach, I.
中科院分区：
文献类型：
--
作者：
Kamachali, R. Darvishi;Borukhovich, E.;Steinbach, I.
我们证明，由第二相沉淀引起的晶体变形可以稳定沉淀周围的溶质梯度。该梯度保持在由沉淀物周围弹性能梯度稳定的准静态状态。因此，在不同尺寸的析出物的排列中，析出物与基质界面的峰浓度与析出物的半径无关，没有激活的熟化机制。该模型解释了Al-Cu中纳米析出物反常稳定性的实验观察。
We demonstrate that the distortion of a crystal, caused by secondary phase precipitates, can stabilize a solutal gradient around the precipitate. The gradient persists in the quasi-static state stabilized by the gradient of the elastic energy around the precipitate. The peak concentration at the interface between precipitate and matrix hereby is independent of the radius of the precipitate and no mechanism of ripening is active in an arrangement of precipitates of different size. The model offers an explanation of experimental observations of the anomalous stability of nano-precipitates in Al-Cu.