The melting and solidification of nanoscale Bi particles embedded in a glassy and crystalline matrix
The melting and solidification of nanoscale Bi particles embedded in a glassy and crystalline matrix
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嵌入玻璃状和晶体基质中的纳米级 Bi 颗粒的熔化和凝固
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
K. Chattopadhyay
中科院分区：
文献类型：
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作者：
R. Goswami;P. Ryder;K. Chattopadhyay
我们报道了嵌入al基玻璃合金基体中的纳米Bi颗粒形成非晶相。高分辨率电子显微镜（HREM）显示，颗粒包含结晶和非晶部分。通过差示扫描量热研究和使用加热阶段的原位电子显微镜，发现铋颗粒结晶部分的熔点降低了100K以上。同样的技术确定了当基体结晶时，颗粒中不存在非晶相。结果表明，在此约束体系中，非晶相的形成和熔点的降低不能用凝固过程中体积变化产生的压力来解释。
We report the formation of an amorphous phase in nanosized Bi particles embedded in an Al-based glassy alloy matrix. High-resolution electron microscopy (HREM) has been used to show that the particles contain crystalline and amorphous portions. A depression of the melting point by more than 100K of the crystalline portion of the Bi particles was found by differential scanning calorimetric studies and by in-situ electron microscopy using a heating stage. The same techniques established the absence of an amorphous phase in the particles when the matrix is crystallized. It is shown that the formation of the amorphous phase and the depression of the melting point cannot be explained by the pressure developed by the volume change during solidification in this constrained system.