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金屬納米晶熱穩(wěn)定性和晶粒長大行為的研究
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國家自然科學基金(50671001，50871001)；教育部新世紀優(yōu)秀人才項目(NCET 2006)；教育部博士點基金(20070005010)


Thermodynamic Stability and Grain Growth Behavior of Nanocrystalline Metal
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    摘要:

    推導出了金屬納米晶界的基本熱力學函數，模擬計算了金屬納米晶界的吉布斯自由能隨晶界過剩體積和溫度的變化規(guī)律。以銅納米晶材料為例，應用納米晶熱力學模型預測了納米晶組織的熱穩(wěn)定性及納米晶粒長大行為。將納米晶界的熱力學函數引入元胞自動機仿真算法，利用計算機模擬研究了金屬納米晶的變溫晶粒長大過程。實驗證實銅納米晶粒長大的動力學特征符合納米晶熱力學模型的計算預測結果

    Abstract:

    The fundamental thermodynamic functions of nanograin boundaries in nanocrystalline metal were derived. The Gibbs free energy as a function of the excess volume and the temperature of the nanograin boundary was simulated and calculated. Using nanocrystalline Cu as an example, the thermodynamic stability and the nanograin growth behavior of nanocrystalline microstructure were predicted by the nanocrystalline thermodynamic model. The thermodynamic functions of nanograin boundaries were introduced into the Cellular Automation algorithm, and the temperature-varying nanograin growth process of nanocrystalline Cu was simulated. The kinetics features of the nanograin growth of the nanocrystalline Cu confirm the predictions from the thermodynamic model

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魏 君,宋曉艷,韓清超,徐文武,李凌梅.金屬納米晶熱穩(wěn)定性和晶粒長大行為的研究[J].稀有金屬材料與工程,2010,39(4):603~607.[Wei Jun, Song Xiaoyan, Han Qingchao, Xu Wenwu, Li Lingmei. Thermodynamic Stability and Grain Growth Behavior of Nanocrystalline Metal[J]. Rare Metal Materials and Engineering,2010,39(4):603~607.]
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  • 收稿日期:2009-04-21
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