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L12相間有序疇界成分的微觀相場研究
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國家自然科學基金項目（50941020，10902086，50875217，20903075）；陜西省自然科學基金項目（SJ08-B14，SJ08-ZT05）


Microscopic Phase-Field Study on the Compositions of Ordered Domain Interfaces Formed between L12 Phases in Ni75AlxV25-x Alloys
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    摘要:

    利用微觀相場模型研究了有序疇界結構、合金成分和彈性應變能對Ni75AlxV25-x合金中L12-Ni3Al相間有序疇界成分的影響規(guī)律。結果表明：L12相間形成的3種有序疇界中， 在(100)//(200)·?[001]處，Ni的貧化程度最小，Al的貧化程度最大，V的偏聚程度最大；在(200)//(200)處，Ni的貧化程度最大，Al的貧化程度最小，V的偏聚程度最小。隨著合金中Al濃度的增加，3種有序疇界處Ni的濃度降低，Al的濃度升高，V的濃度降低。彈性應變能使得L12相間3種有序疇界處Ni和Al的濃度升高，V濃度降低。但彈性應變能對(200)//(200)·?[001]和(100)//(200)·?[001]成分的影響較大，對(200)//(200)成分的影響則相對較小。

    Abstract:

    Microscopic phase-field model was used to study the effect of atomic structure of interfaces, composition of alloys and elastic strain energy on the compositions of ordered domain interfaces formed between L12-Ni3Al phases in Ni75AlxV25-x alloys. The results demonstrate that the depletion degree of Ni is the lowest, and the depletion degree of Al and the segregation degree of V are the highest at the interface (100)//(200)·?[001]; the depletion degree of Ni is the highest, and the depletion degree of Al and the segregation degree of V are the lowest at the interface (200)//(200) among the three kinds of interfaces formed between L12-Ni3Al phases. With the Al concentration of alloys increasing, the concentration of Al increases while the concentrations of Ni and V decrease at the ordered domain boundaries formed between L12-Ni3Al phases. When the elastic strain energy is considered during the simulation, the concentrations of Ni and Al increase while the concentration of V decrease at the three kinds of ordered domain interfaces. The effect of elastic strain energy on the composition of (200)//(200)·?[001] and (100)//(200)·?[001] is much more remarkable than on that of (200)//(200).

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張明義,楊 坤,陳 錚,王永欣,張嘉振. L12相間有序疇界成分的微觀相場研究[J].稀有金屬材料與工程,2013,42(6):1194~1198.[Zhang Mingyi, Yang Kun, Chen Zhen, Wang Yongxin, Zhang Jiazhen. Microscopic Phase-Field Study on the Compositions of Ordered Domain Interfaces Formed between L12 Phases in Ni75AlxV25-x Alloys[J]. Rare Metal Materials and Engineering,2013,42(6):1194~1198.]
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  • 收稿日期:2012-06-15
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