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首页> 外文会议>TMS(The Minerals, Metals amp; Materials Society) Annual Meeting and Symposium on Surfaces and Interfaces in Nanostructured Materials and Trends in LIGA, Miniaturization, and Nanoscale Materials; 20040314-20040318; Charlotte,NC; US >INTERFACE-CONTROLLED NANOCRYSTAL PHASE TRANSFORMATIONS
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INTERFACE-CONTROLLED NANOCRYSTAL PHASE TRANSFORMATIONS

机译：界面控制的纳米相变

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摘要

The impact of interface properties and - more specifically - of the morphology of the interface of matrix-encased metallic nanoparticles on macroscopic properties such as the melting behavior has been investigated experimentally by a combination of microscopic, microanalytical and calorimetric measurement methods. As one result, the measurements clearly indicate that the shift of the melting temperature at small system size is thermodynamic in nature, as opposed to explanations based on nucleation kinetics. In addition to the energetic contribution of the outer interface of the nanoscaled particles with the environment, internal interfaces become important if multiphase alloy nanoparticles are concerned. Here, first results on nanoscaled binary alloy systems indicate that major deviations of the constitutive behavior and even in the construction rules for phase diagrams occur when the alloy particle size becomes of the order of 50 nm or less.
机译：结合微观，微观分析和量热测量方法，已通过实验研究了界面性能，尤其是基质包裹的金属纳米颗粒的界面形态对宏观性能（如熔融行为）的影响。结果，测量结果清楚地表明，与基于成核动力学的解释相反，在小系统尺寸下熔融温度的变化本质上是热力学的。除了纳米级颗粒的外部界面与环境的有力贡献之外，如果考虑到多相合金纳米颗粒，内部界面也变得很重要。在此，关于纳米级二元合金系统的初步结果表明，当合金粒度变为50 nm或更小时，就会发生本构行为的重大偏差，甚至在相图的构造规则中也是如此。

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