在纳米结构的金属及合金中,随着晶粒尺寸的下降,晶界体积分数显著增加,使得晶粒长大的驱动力提高,因此纳米金属在加热时(甚至是室温下)是不稳定的.对Trelewicz/Schuh(TS)模型进行了修正,并利用修正的模型对Cu-Sn纳米晶合金的热力学稳定倾向做了计算研究.利用机械合金化的方法制备不同溶质含量的Cu-Sn纳米晶合金,在不同温度下进行退火实验.实验结果及理论计算表明,随着溶质原子的加入及在晶界的偏聚,Cu-Sn纳米晶合金的晶粒长大得到抑制,热力学稳定性提高.
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