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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 >IN-SITU TEM OBSERVATION OF CRYSTALLINE-TO-LIQUID PHASE CHANGE IN NANOMETER-SIZED ALLOY PARTICLES
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IN-SITU TEM OBSERVATION OF CRYSTALLINE-TO-LIQUID PHASE CHANGE IN NANOMETER-SIZED ALLOY PARTICLES

机译：纳米合金颗粒中晶相到相变的原位TEM观察

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Alloy phase formation in nanometer-sized particles has been studied using particles in the Sn-Bi system at a temperature above the eutectic temperature. In the tin-rich side, with increasing bismuth concentration, an approximately 8-nm-sized particle of the terminal tin solid solution directly changed into a liquid phase, without taking a stage of solid-liquid coexistence. In the bismuth-rich side, an approximately 8-nm-sized particle of the terminal bismuth solid solution changed first to a particle with a crystal/liquid two-phase microstructure and eventually to a liquid phase, with increasing tin concentration. An approximately 5-nm-sized particle of the terminal bismuth solid solution, however, directly changed into a liquid phase with increasing tin concentration. From these results, it is expected that the contribution of solid/liquid interface to the total Gibbs free energy is so large with decreasing system size that the behavior of crystalline-to-liquid phase change in nanometer-sized alloy particles is significantly different from that of the corresponding bulk materials.
机译：已经在高于共晶温度的温度下使用Sn-Bi系统中的颗粒研究了纳米尺寸颗粒中的合金相形成。在富锡方面，随着铋浓度的增加，末端锡固溶体的大约8纳米大小的颗粒直接变为液相，而没有固液共存的阶段。在富铋方面，随着锡浓度的增加，最终铋固溶体的约8 nm尺寸的颗粒首先变为具有晶体/液体两相微结构的颗粒，最后变为液相。然而，随着锡浓度的增加，最终铋固溶体的大约5纳米大小的颗粒直接变为液相。从这些结果可以预期，随着系统尺寸的减小，固/液界面对总Gibbs自由能的贡献如此之大，以至于纳米尺寸合金颗粒中晶相到液相的变化行为与之明显不同。相应的散装材料。

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