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納米鈦合金成分聚集的改進(jìn)Miedema模型
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湖南省教育廳資助科研項(xiàng)目（06C508）；湖南省科技計劃（2009FJ3153）；國家教育部大學(xué)生創(chuàng)新計劃及湖南省研究生科研創(chuàng)新計劃（CX2009B102）


Modified Miedema Model for Component Segregation of Nano Ti Binary Alloys
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    摘要:

    考慮表面效應(yīng)，利用改進(jìn)Miedema模型推導(dǎo)得到納米二元合金形成焓的計算公式，并將它用于二元Ti-M (M＝Si, Fe, Zn, Tc, Cd, Re, Os, Pb, Bi)納米合金形成焓的研究。結(jié)果表明，對于同一成分的納米合金來說，隨著晶粒粒徑的減小，形成焓增加，合金穩(wěn)定性降低。晶粒尺寸在10 nm以下時，成分聚集現(xiàn)象十分明顯，合金的聚集方向和聚集程度由聚集驅(qū)動能控制。

    Abstract:

    Taking account of the surface effect, the formula for the calculation of the formation enthalpy of nano Ti binary alloys was deduced by modified Miedema model. And the formula was used to study the formation enthalpy of Ti-M (M=Si, Fe, Zn, Tc, Cd, Re, Os, Pb, Bi) nano binary alloys. The results show that the formation enthalpy and structure stability are affected by the grain size for Ti binary alloys with the same composition. That is to say, the smaller the particle size, the greater the formation enthalpy and the worse the structure stability. Also, the component segregation for the nano Ti binary alloys is very clear when the grain size is less than 10 nm. The direction and the degree of aggregation are controlled by the aggregation driving energy.

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謝 斌,廖樹幟,陳 佳,呂云賓,彭好軍,王小麗,張 淳,謝浩文,歐陽義芳,張邦維.納米鈦合金成分聚集的改進(jìn)Miedema模型[J].稀有金屬材料與工程,2010,39(7):1175~1179.[Xie Bin, Liao Shuzhi, Chen Jia, Lü Yunbin, Peng Haojun, Wang Xiaoli, Zhang Chun, Xie Haowen, Ouyang Yifang, Zhang Bangwei. Modified Miedema Model for Component Segregation of Nano Ti Binary Alloys[J]. Rare Metal Materials and Engineering,2010,39(7):1175~1179.]
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  • 收稿日期:2009-08-15
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