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考虑表面效应,利用改进Miedema模型推导得到纳米二元合金形成焓的计算公式,并将它用于二元Ti-M (M=Si, Fe, Zn, Tc, Cd, Re, Os, Pb, Bi)纳米合金形成焓的研究.结果表明,对于同一成分的纳米合金来说,随着晶粒粒径的减小,形成焓增加,合金稳定性降低.晶粒尺寸在10 nm以下时,成分聚集现象十分明显,合金的聚集方向和聚集程度由聚集驱动能控制.

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