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共格沉淀相粗化行為的計算機模擬研究
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TG113.12

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國家自然科學(xué)基金資助(50071046)


Computer Simulation of Coarsening Behavior of Coherent Precipitants
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    摘要:

    將微觀彈性應(yīng)變能理論和微觀擴散方程相耦合，建立起時效過程微觀晶格動力學(xué)模型。對溶質(zhì)濃度為14at％的二元立方點陣模型合金的共格沉淀粗化行為進行模擬。研究發(fā)現(xiàn)：該合金沉淀機制以形核長大為主，兼有失穩(wěn)分解特征；由于共格失配，沉淀相為片狀，趨于沿彈性軟化方向排列。其粗化作為伴隨過程進行，位于軟方向上的顆粒繼續(xù)長大和粗化，位于軟方向外的顆粒逐漸消失；而位于同一行或列上的顆粒則遵循：小顆粒溶解，大顆粒長大。

    Abstract:

    The microscopic lattice kinetic model of aging process was build, using the coupling of the theory of microscopic elastic energy and microscopic diffusion equation. Taking a binary cubic model alloy with 14% (solute atom percent) as a example, the coarsening behavior of coherent precipitants was simulated. The results show that the main precipitation mechanism is nucleation and growth, while transient spinodal decomposition can also occur; In the presence of coherent mismatch, plate-like precipitants are formed, and tend to align along the elastically soft directions. During its coarsening process, particles lying in the soft directions grow and coarsen further, particles lying out of the soft directions dwindle. The coarsening process of the particles sitting in the same row or column obey that smaller particles shrink and larger ones grow.

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趙宇宏 陳錚 王永欣 劉兵 馬良.共格沉淀相粗化行為的計算機模擬研究[J].稀有金屬材料與工程,2004,33(3):234~238.[Zhao Yuhong, Chen Zheng, Wang Yongxin, Liu Bing, Ma Liang. Computer Simulation of Coarsening Behavior of Coherent Precipitants[J]. Rare Metal Materials and Engineering,2004,33(3):234~238.]
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  • 最后修改日期:2002-05-29
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