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四近鄰對勢對Ni75Al5V20合金沉淀機制影響的 微觀相場模擬
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國家自然科學基金(50671084); 陜西省自然科學基金資助項目


Microscopic Phase-Field Simulation for the Effect of the Fourth-Nearest Pair Potentials on Precipitation Mechanism of Ni75Al5V20 Alloy
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    摘要:

    利用微觀相場動力學模型，研究了4近鄰對勢對Ni75Al5V20合金沉淀機制的影響。結果表明，不改變4近鄰對勢，DO22相和L12相沉淀機制均為失穩(wěn)分解與非經(jīng)典形核混合型機制。隨Ni-Al 4近鄰對勢V4Ni-Al向負值方向絕對值增大，L12相沉淀機制轉變?yōu)槭Х€(wěn)分解。隨Ni-V 4近鄰對勢V4Ni-V增大，DO22相沉淀機制轉變?yōu)槭Х€(wěn)分解，L12相轉變?yōu)榉墙?jīng)典形核機制，L12相中的Al濃度平衡值增大。隨Al-V 4近鄰對勢V4Al-V向負值方向絕對值增大，對沉淀機制的影響趨勢與V4Ni-V增大類似；隨V4Al-V向正值方向增大，與V4Ni-V減小的影響類似

    Abstract:

    The effect of the fourth-nearest pair potentials on the precipitation mechanism of Ni75Al5V20 alloy is studied using a microscopic phase-field kinetic equation. Our simulations demonstrate that both DO22 phase and L12 phase have a mixed precipitation mechanism of non-classical nucleation growth and spinodal decomposition without changing the fourth-nearest pair potentials. When the absolute value of the fourth-nearest pair potential between Ni and Al (namely V4Ni-Al, negative) increases, the precipitation mechanism of L12 phase becomes spinodal decomposition. And when the fourth-nearest pair potential between Ni and V (namely V4Ni-V) increases, the precipitation mechanism of DO22 phase is spinodal decomposition, the L12 phase is non-classical nucleation and the Al concentration in L12 phase gains. When the absolute value of the negative V4Al-V increases, the mechanism is similar to the increase of V4Ni-V; when the positive V4Al-V increases, the mechanism is similar to the decrease of V4Ni-V

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甄輝輝,王永欣,陳 錚,張 靜,張明義,霍進良.四近鄰對勢對Ni75Al5V20合金沉淀機制影響的 微觀相場模擬[J].稀有金屬材料與工程,2009,38(2):286~290.[Zhen Huihui, Wang Yongxin, Chen Zheng, Zhang Jing, Zhang Mingyi, Huo Jinliang. Microscopic Phase-Field Simulation for the Effect of the Fourth-Nearest Pair Potentials on Precipitation Mechanism of Ni75Al5V20 Alloy[J]. Rare Metal Materials and Engineering,2009,38(2):286~290.]
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  • 收稿日期:2008-01-26
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