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Ni-Al-V合金中異相界面成分及其演化的微觀相場(chǎng)模擬
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國(guó)家自然科學(xué)基金 (50941020, 10902086, 50875217, 20903075)；西北工業(yè)大學(xué)博士創(chuàng)新基金 (xc200905)


Microscopic Phase Field Simulation on the Solute Segregation and Composition Evolution of Heterointerfaces in Ni-Al-V Alloy
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    摘要:

    基于微觀相場(chǎng)模型模擬Ni-Al-V合金沉淀過(guò)程，研究合金中有序無(wú)序界面和異相間有序疇界的成分及其演化。研究表明，合金元素的偏聚和貧化與界面類型有關(guān)。在DO22相與無(wú)序相間的有序無(wú)序界面處，Ni和Al偏聚，V貧化；在L12相與無(wú)序相間的有序無(wú)序界面處，Ni和Al貧化，V偏聚；在異相間有序疇界處，V在界面的DO22相一側(cè)貧化，在界面的L12相一側(cè)偏聚；Al則在界面的DO22相一側(cè)偏聚，在界面的L12相一側(cè)貧化。Ni的成分分布與界面的形成方式有關(guān)。隨著時(shí)間的進(jìn)行，界面處合金元素的成分分布變得更加明銳，但合金元素的偏聚和貧化傾向不變

    Abstract:

    Based on the microscopic phase field model, the precipitation process of Ni-Al-V alloy was simulated. The composition distribution and the evolution of order-disordering interface and ordered heterointerface formed between DO22 and L12 phase were studied. The results show that the degree and the preference of segregation or the depletion of alloying elements are related with the atomic structure of interfaces. Ni and Al segregate, V depletes at the order-disorder interface formed between DO22 and disorder phases. Ni and Al deplete, V segregates at the order-disorder interface formed between L12 and disorder phases. At the ordered heterointerfaces, V segregates at the DO22 side of the interface but depletes at the L12 side of the interface, Al depletes at the DO22 side of the interface but segregates at the L12 side of the interface. The distribution of Ni at the ordered heterointerface is related with the formation process of the interface. The preferences of segregation or the depletion of alloy elements remain unchanged, but the distribution of alloy elements becomes sharp during the evolution of interface

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張明義,楊 坤,陳 錚,王永欣,范曉麗. Ni-Al-V合金中異相界面成分及其演化的微觀相場(chǎng)模擬[J].稀有金屬材料與工程,2012,41(8):1376~1380.[Zhang Mingyi, Yang Kun, Chen Zheng, Wang Yongxin, Fan Xiaoli. Microscopic Phase Field Simulation on the Solute Segregation and Composition Evolution of Heterointerfaces in Ni-Al-V Alloy[J]. Rare Metal Materials and Engineering,2012,41(8):1376~1380.]
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  • 收稿日期:2011-08-09
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