Peculiarities of discontinuous precipitation in the Pb-Sn alloy

被引：0

作者：

Lyashenko, Yu.A. ^{[1
]}

Zaitzeva, N.V. ^{[2
]}

Shmatko, O.A. ^{[2
]}

机构：

[1] Department of Theoretical Physics, Cherkasy National University, Cherkasy, 18031

[2] Department of Diffusion Processes, G.V. Kurdyumov Institute for Metal Physics, Kyiv-142, 03680

来源：

| 2007年 / Trans Tech Publications Ltd卷 / 261-262期

关键词：

Diffusion; Discontinuous precipitation; Entropy production; Grain-boundary diffusion; Interphase boundary;

D O I：

10.4028/www.scientific.net/ddf.261-262.61

中图分类号：

学科分类号：

摘要：

A model of discontinuous precipitation in binary polycrystalline alloys at low temperatures is presented. The proposed approach allows independent determination of the main parameters, including the interlamellar distance, the maximum velocity of the phase transformation front, and the concentration step at this boundary. This is achieved by using a set of equations for: 1) the mass transfer in the moving interphase boundary; 2) the balance of the entropy fluxes at the phase transformation front, and 3) the maximum rate of the free energy release under constraint of entropy balance. Concepts of mobility and linear interrelation between the driving force and velocity are not used explicitly. Comparison of the model calculation with the experimental results for the Pb-Sn system at different supersaturations is provided.

引用

页码：61 / 75

页数：14

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