Comparison between Kinetic and Thermodynamic Effects on Grain Growth in Nano-Scale Materials

Abstract:

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A detailed comparison between kinetic and thermodynamic effects on grain growth in nanocrystalline Gd doped ceria ceramics was given. From the thermodynamic standpoint, the evolution of grain size with annealing time can be described using an analytical model for grain boundary segregation upon isothermal grain growth. From the kinetic standpoint, the single isothermal grain growth can be understood in terms of a single, thermally-activated rate process with constant grain boundary energy, σb. The solute excess in grain boundaries increases with grain growth and tends to its saturated value, therefore, the inhibition of grain growth can be attributed to the reduction of grain boundary energy σb through solute segregation.

Info:

Periodical:

Advanced Materials Research (Volumes 233-235)

Edited by:

Zhong Cao, Lixian Sun, Xueqiang Cao, Yinghe He

Pages:

2439-2442

DOI:

10.4028/www.scientific.net/AMR.233-235.2439

Citation:

Z. Chen et al., "Comparison between Kinetic and Thermodynamic Effects on Grain Growth in Nano-Scale Materials", Advanced Materials Research, Vols. 233-235, pp. 2439-2442, 2011

Online since:

May 2011

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Price:

$35.00

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