PHASE FIELD SIMULATION OF PARITICLE GROWTH AND OSTWALD RIPENING FOR CU-PB MONOTECTIC ALLOY

Acta Metall Sin

2007, Vol. 43

Issue (9): 907-912 DOI:

Research Articles

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PHASE FIELD SIMULATION OF PARITICLE GROWTH AND OSTWALD RIPENING FOR CU-PB MONOTECTIC ALLOY

Hongbao CUI;

哈尔滨工业大学材料科学与工程学院

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Hongbao CUI. PHASE FIELD SIMULATION OF PARITICLE GROWTH AND OSTWALD RIPENING FOR CU-PB MONOTECTIC ALLOY. Acta Metall Sin, 2007, 43(9): 907-912 .

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Abstract Cahn-Hilliard equation coupling with thermodynamic data is solved by Fourier transformation spectrum method due to the high efficiency and accuracy to simulate particle growth and Ostwald ripening for Cu-Pb monotectic alloy at the isothermal condition. The simulation results show that particle growth and Ostwald ripening for specific Cu-Pb monotectic alloy can be realized by the adjustment of gradient coefficient and mobility ratio. The growth of singular nucleated particles in a supersaturated matrix depends on the adjustment of free energy function and the smaller gradient coefficient, the more distinct steepness of concentration profile is. Growth rate of particle radius is in good agreement with the well accepted Zener’s law. Size distribution of reduced particle radius is computed and the peak of radius distribution changes from approaching the average radius to exceeding it.

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Received: 09 November 2006

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2007/V43/I9/907

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