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應力場對相分解過程影響的計算機模擬研究(Ⅱ)——非對稱成分及拐點以下的相分離模擬
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TG146.21

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國家自然科學基金資助項目(50271084)


Effect of Stress Field on Phase Separation Process by Computer Simulation (II): Simulation of Asymmetrical and below Spinodal Composition Phase Separation Process
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    摘要:

    采用擴散界面場模型對非對稱成分點及拐點以下成分點同構兩相分解過程中應力場(包括外場)對析出相的形態(tài)及動力學過程的影響作了比較系統(tǒng)的研究.模擬結果表明:對于各向異性系統(tǒng)在相分解過程中由于彈性應變能與界面能間的相互作用將會導致析出相在不同階段呈現(xiàn)不同的形貌如網格結構、三明治多疇結構、沉淀宏觀點陣結構以及板條狀等;對于非均勻彈性模量系統(tǒng)在外加應力場作用下,沉淀相的析出過程發(fā)生重大的變化,粒子沿彈性軟方向呈各向異性析出.此外,模擬結果還發(fā)現(xiàn),在應力場(包括外加場情況)存在條件下,相析出的中前期長大過程中小粒子沿著彈性軟方向相互聯(lián)結成大粒子,在相變后期孤立的小粒子被大粒子的長大所消耗.

    Abstract:

    Morphological evolutions and kinetics process controlled by transformation-induced elastic strain (include external strain field) during isostructure phase separation are systematically investigated using prototype binary alloy by diffuse-interface field model. The results show that various types of morphologies, such as basket-weave structures, sandwich-like multi-domain structures, precipitate macro lattices and plate-like structures, are predicted in different stages of phase separation. It is demonstrated that the precipitates are preferentially oriented with an external stress for an inhomogeneous elastic modulus system. Moreover, the simulation results also indicate that the small particles will be connected along elastic soft directions to formation bigger particles in the stage of growth and those small isolated particles will be consumed by bigger particles in the stage of ripening.

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陳大欽 李世晨 鄭子樵 劉祖耀 李劍.應力場對相分解過程影響的計算機模擬研究(Ⅱ)——非對稱成分及拐點以下的相分離模擬[J].稀有金屬材料與工程,2005,34(9):1430~1434.[Chen DaQin;Li ShiChen;Zheng ZiQiao;Liu ZuYao;Li Jian. Effect of Stress Field on Phase Separation Process by Computer Simulation (II): Simulation of Asymmetrical and below Spinodal Composition Phase Separation Process[J]. Rare Metal Materials and Engineering,2005,34(9):1430~1434.]
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  • 收稿日期:2004-03-16
  • 最后修改日期:2004-09-21
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