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Ni—Al-V合金有序疇界面結(jié)構(gòu)的微觀相場模擬
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TG146.15

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國家自然科學(xué)基金資助（50071046）：國家“863”高新技術(shù)研究計劃項目（2002AA331051）


Computer Simulation of Ordered Interphase Boundary Structure of Ni-Al-V Alloy Using Microscopic Phase-Field Method
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    摘要:

    利用微觀相場動力學(xué)模型模擬了Ni-Al-V合金沉淀有序相之間界面的微結(jié)構(gòu)及其演化過程。研究結(jié)果表明，Ll2相之間形成3種類型的疇界結(jié)構(gòu)，界面寬度較小，其中一種界面處Al原子占位幾率基本達平衡值。D022相根據(jù)投影后[10]和[01]兩個不同取向的結(jié)合，形成8種類型的疇界結(jié)構(gòu)，相同取向的疇界較寬，不同取向的疇界處V原子占位幾率較高。兩種不同有序相形成4種類型疇界，由于后析出相在先析出相的界面形核長大，界面處相應(yīng)原子占位幾率達平衡值，兩相界面處連續(xù)過渡。D022有序相[01]方向形成的界面隨沉淀過程進行，由無序變?yōu)橛行蛘缑?，之后界面處又發(fā)生分解成為無序相。

    Abstract:

    The microscopic structure and evolution of ordered interphase boundary of Ni-Al-V alloy was investigated using microscopic phase-field model. The results show that three kinds of interphase boundaries are formed between LI2 phases, the width of the interphase boundaries are narrower, and of which one kind of interphase boundary is in equilibrium for the occupation probability of Al atoms. According to the different orientation variants of [ 10] and [01 ] of the projection of D022, there form eight kinds of interphase boundaries structure, in which the interphase boundaries are wider with the same orientation variants, and the occupation probability of V atoms reach the equilibrium value with different orientation variants. There are four kinds of interphase boundaries between the different phases. The occupation probability of atoms in the interphase boundaries reach the equilibrium value and two phase transit continuously, for one phase precipitate from the interphase boundary of another. With the precipitation process, the interphase boundaries formed in [01] direction of D022 transform from disordered to ordered and become narrower firstly and then dissolve into disordered phase.

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李永勝 陳錚 盧艷麗 王永欣 褚忠. Ni—Al-V合金有序疇界面結(jié)構(gòu)的微觀相場模擬[J].稀有金屬材料與工程,2006,35(2):200~204.[Li Yongsheng, Chen Zheng, Lu Yanli, Wang Yongxin, Chu Zhong. Computer Simulation of Ordered Interphase Boundary Structure of Ni-Al-V Alloy Using Microscopic Phase-Field Method[J]. Rare Metal Materials and Engineering,2006,35(2):200~204.]
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  • 收稿日期:2004-10-15
  • 最后修改日期:2005-01-28
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