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Al-14Cu-7Ce合金中Al8CeCu4相的Ostwald熟化行為研究
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常州大學(xué),常州大學(xué) 材料學(xué)院,常州大學(xué) 材料學(xué)院,常州大學(xué) 材料學(xué)院,中南大學(xué) 材料學(xué)院

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國家自然科學(xué)基金 (51075335, 51174168, 10902086, 51274167)；西北工業(yè)大學(xué)基礎(chǔ)研究基金 (JC20120222)


The Ostwald ripening behavior of Al8CeCu4 phase in Al-14Cu-7Ce alloy
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Changzhou University,School of Materials Science and Engineering, Changzhou University,School of Materials Science and Engineering, Changzhou University,School of Materials Science and Engineering, Changzhou University,School of Materials Science and Engineering, Central South University

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    摘要:

    本文采用硬度測試、掃描電鏡、圖像分析和物理建模，研究了Al-14Cu-7Ce合金中Al8CeCu4相的Ostwald熟化行為。研究結(jié)果表明，Al8CeCu4相的熟化過程受控于Ce元素在Al中的體擴(kuò)散，其動(dòng)力學(xué)滿足體積修正的Lifshits-Slyozov-Wagner理論；基于通用速率公式，計(jì)算了Ce元素在Al中的體擴(kuò)散系數(shù)以及Al8CeCu4與Al基體的界面能。

    Abstract:

    The Ostwald ripening behavior of Al8CeCu4 phase in the Al-14Cu-7Ce alloy annealing at elevated temperatures was investigated using hardness testing, scanning electron microscopy, image analyses and physical modeling. The average radius of Al8CeCu4 particles increases while the hardness of the alloy decreases with increasing annealing temperature and time. The ripening process of Al8CeCu4 phase is mainly controlled by the volume diffusion of Ce. The ripening kinetic of Al8CeCu4 particles satisfies well the modified Lifshits-Slyozov-Wagner theory, taking into account the effect of the volume fraction of Al8CeCu4 particles. The volume diffusion coefficient of Ce and the interfacial energy between the matrix and Al8CeCu4 phase are also calculated based on the general rate equation.

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李海,王芝秀,方必軍,宋仁國,鄭子樵. Al-14Cu-7Ce合金中Al8CeCu4相的Ostwald熟化行為研究[J].稀有金屬材料與工程,2016,45(5):1106~1110.[Li Hai, Wang Zhixiu, Fang Bijun, Song Renguo, Zheng Ziqiao. The Ostwald ripening behavior of Al8CeCu4 phase in Al-14Cu-7Ce alloy[J]. Rare Metal Materials and Engineering,2016,45(5):1106~1110.]
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  • 收稿日期:2014-03-29
  • 最后修改日期:2015-01-15
  • 錄用日期:2015-02-06
  • 在線發(fā)布日期: 2016-06-02
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