Solid solubility in isolated nanometer-sized alloy particles in the Sn-Pb system
Solid solubility in isolated nanometer-sized alloy particles in the Sn-Pb system
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DOI：
10.1140/epjd/e2005-00148-y
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发表时间：
2005-07
期刊：
影响因子：
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通讯作者：
Jung-Goo Lee;H. Mori
中科院分区：
文献类型：
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作者：
Jung-Goo Lee;H. Mori
采用原位透射电镜研究了有限尺寸对纳米级铅颗粒固溶度和热膨胀系数的影响。在室温下，锡在大约12纳米大小的铅颗粒中的固体溶解度高于30%，这几乎是相应体积铅的10倍。铅的热膨胀系数从29×10-6K-1for体积增大到38×10-6K-1when，颗粒尺寸从∞（体积）减小到16纳米。热膨胀系数随颗粒尺寸的减小而增大，表明黏结能减小，从而弹性模量随颗粒尺寸的减小而减小。因此，固溶体中应变能的抑制可能是纳米合金颗粒固溶性增强的原因。
The finite size effect on both the solid solubility and the thermal expansion coefficient in nanometer-sized lead particles was examined by in-situ transmission electron microscopy. The solid solubility of tin in approximately 12-nm-sized particles of lead at room temperature was evaluated be higher than 30 atomic percent, which is almost ten times higher than that in the corresponding bulk lead. The thermal expansion coefficient of lead increased from 29×10-6K-1for bulk to 38×10-6K-1when the size of particles decreased from ∞ (bulk) to 16 nanometers. The increment of the thermal expansion coefficient with decreasing size of particles suggests the reduction of the cohesive energy and therefore the reduction of the elastic modulus with decreasing size of particles. It is then considered that the suppression of the strain energy in the solid solution may be responsible for the enhanced solid solubility in nanometer-sized alloy particles.