In situ high-resolution electron microscope observation of phase change in nanometer-sized alloy particles
In situ high-resolution electron microscope observation of phase change in nanometer-sized alloy particles
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DOI：
10.1557/jmr.2005.0223
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发表时间：
2005-07
影响因子：
2.7
通讯作者：
Jung-Goo Lee;H. Mori;H. Yasuda
中科院分区：
文献类型：
--
作者：
Jung-Goo Lee;H. Mori;H. Yasuda
通过对纳米颗粒中合金相形成的原位电子显微镜研究表明，两种不同相(固-固或固-液)界面的表面能和界面能显著地改变了纳米颗粒的相平衡。这些能量导致孤立的纳米合金颗粒的共晶点受到很大的抑制，结构不稳定，以及独特的固/液两相结构。以热力学为基础的理论研究，考虑了影响纳米合金颗粒相平衡的因素，修正了块体材料的Gibbs自由能，对实验结果进行了评价。
From the study of alloy phase formation in nanometer-sized particles by in situ transmission electron microscopy, it is revealed that not only the surface energy but also the interface energy of an interface between two different phases (solid–solid or solid–liquid) significantly changes the phase equilibrium of nanometer-sized particles. These energies result in large suppression of the eutectic point, structural instability, and unique solid/liquid two-phase structures in isolated nanometer-sized alloy particles. A theoretical study based on thermodynamics, which is modified in such a manner that Gibbs free energies for bulk materials were modified by taking factors affecting the phase equilibrium of nanometer-sized alloy particles into consideration, was proved useful to evaluate the results obtained from experiments.