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[期刊论文]

Thermodynamic functions and phase transformation of metal nanocrystals

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作者:

Gao, Jinping (Gao, Jinping.) | Song, Xiaoyan (Song, Xiaoyan.) (学者:宋晓艳) | Zhang, Jiuxing (Zhang, Jiuxing.) | 展开

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摘要:

A model to calculate the thermodynamic functions of the pure metal nanocrystals has been developed, with the consideration of the effects of both the interfaces and the crystal in the nano-grain interior. As an example, the enthalpy, entropy and Gibbs free energy, as functions of the excess free volume at interfaces, temperature and grain size, are calculated for the Co nanocrystals. Furthermore, the characteristics of β-Co&rarrα-Co phase transformation are studied, and the transformation temperatures at different levels of grain size, as well as the critical grain sizes at different temperatures, are predicted. The calculation results show that, the nano-grained β-Co (fcc) is thermodynamically stable at temperatures much lower than that for the conventional coarse-grained materials, and may also stably exist at room temperature when the grain size is reduced to be small enough. The present model is verified by comparisons between the experimental findings and the theoretical predictions.

关键词:

Thermodynamics Phase transitions Nanostructured materials Cobalt Mathematical models Grain size and shape

作者机构:

  • [ 1 ] [Gao, Jinping]Key Laboratory of Advanced Functional Materials, College of Materials Science and Engineering, Beijing University of Technology, Beijing 100022, China
  • [ 2 ] [Song, Xiaoyan]Key Laboratory of Advanced Functional Materials, College of Materials Science and Engineering, Beijing University of Technology, Beijing 100022, China
  • [ 3 ] [Zhang, Jiuxing]Key Laboratory of Advanced Functional Materials, College of Materials Science and Engineering, Beijing University of Technology, Beijing 100022, China
  • [ 4 ] [Yang, Keyong]Key Laboratory of Advanced Functional Materials, College of Materials Science and Engineering, Beijing University of Technology, Beijing 100022, China
  • [ 5 ] [Liu, Xuemei]Key Laboratory of Advanced Functional Materials, College of Materials Science and Engineering, Beijing University of Technology, Beijing 100022, China

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相关文章:

来源 :

Journal of Materials Science and Technology

ISSN: 1005-0302

年份: 2005

期: 5

卷: 21

页码: 705-709

1 0 . 9 0 0

JCR@2022

ESI学科: MATERIALS SCIENCE;

JCR分区:4

被引次数:

WoS核心集被引频次: 0

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