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Phase Field Crystal Study on the Temporal Evolution and Coarsening Mechanism of Precipitates during Spinodal Decomposition
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Phase Field Crystal Study on the Temporal Evolution and Coarsening Mechanism of Precipitates during Spinodal Decomposition
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National Natural Science Foundation of China (51075335, 10902086 and 51174168); Northwestern Polytechnical University Foundation for Fundamental Research (NPU-FFR-JC201005) and the Graduate Starting Seed Fund of Northwestern Polytechnical University (2012042)

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    摘要:

    以二元對稱與非對稱合金的調(diào)幅分解為研究對象，采用晶體相場模型從沉淀相演化和粗化機制兩方面分析合金的失穩(wěn)分解。研究表明，當(dāng)合金的成分由對稱點向非對稱點轉(zhuǎn)變時，沉淀相形貌逐漸由長條形過渡為球形；后期粗化機制由鄰近顆粒的合并機制轉(zhuǎn)變?yōu)镺stwald熟化機制；只有當(dāng)二元合金的成分接近于失穩(wěn)線時，其粗化動力學(xué)才較好地與修正的LSW理論符合

    Abstract:

    The spinodal decomposition of symmetric and asymmetric binary alloys has been studied from precipitate evolution and coarsening mechanism by a binary phase field crystal method. The calculated results indicate that when the alloy composition changes from a symmetric point to the asymmetric one, the morphology of decomposed phases transforms gradually from long stripes to spheres, with the coarsening mechanism undergoing a transition from the coalescence of neighboring particles to Ostwald ripening. Only the coarsening kinetics of the binary alloys which is close to the spinodal decomposition line is in a fair agreement with the prediction of the modified LSW theory

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楊 濤,陳 錚,張 靜,董衛(wèi)平,伍 林. Phase Field Crystal Study on the Temporal Evolution and Coarsening Mechanism of Precipitates during Spinodal Decomposition[J].稀有金屬材料與工程,2013,42(9):1773~1778.[Yang Tao, Chen Zheng, Zhang Jing, Dong Weiping, Wu Lin. Phase Field Crystal Study on the Temporal Evolution and Coarsening Mechanism of Precipitates during Spinodal Decomposition[J]. Rare Metal Materials and Engineering,2013,42(9):1773~1778.]
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  • 收稿日期:2012-09-25
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