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首页> 美国卫生研究院文献>Scientific Reports >Microstructural evolution during sintering of copper particles studied by laboratory diffraction contrast tomography (LabDCT)
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Microstructural evolution during sintering of copper particles studied by laboratory diffraction contrast tomography (LabDCT)

机译：铜粒子烧结过程中的微观结构演变通过实验室衍射对比层析成像技术（LabDCT）研究

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Pressureless sintering of loose or compacted granular bodies at elevated temperature occurs by a combination of particle rearrangement, rotation, local deformation and diffusion, and grain growth. Understanding of how each of these processes contributes to the densification of a powder body is still immature. Here we report a fundamental study coupling the crystallographic imaging capability of laboratory diffraction contrast tomography (LabDCT) with conventional computed tomography (CT) in a time-lapse study. We are able to follow and differentiate these processes non-destructively and in three-dimensions during the sintering of a simple copper powder sample at 1050 °C. LabDCT quantifies particle rotation (to <0.05° accuracy) and grain growth while absorption CT simultaneously records the diffusion and deformation-related morphological changes of the sintering particles. We find that the rate of particle rotation is lowest for the more highly coordinated particles and decreases during sintering. Consequently, rotations are greater for surface breaking particles than for more highly coordinated interior ones. Both rolling (cooperative) and sliding particle rotations are observed. By tracking individual grains the grain growth/shrinkage kinetics during sintering are quantified grain by grain for the first time. Rapid, abnormal grain growth is observed for one grain while others either grow or are consumed more gradually.
机译：颗粒重排，旋转，局部变形和扩散以及晶粒长大的结合，会在高温下对疏松或压实的粒状体进行无压烧结。对这些过程中的每一个如何促进粉末体的致密化的了解仍然不成熟。在这里，我们报告了一项基础研究，在延时研究中将实验室衍射对比层析成像（LabDCT）的晶体成像能力与常规计算机层析成像（CT）相结合。在1050°C的温度下烧结一个简单的铜粉样品时，我们能够无损地按照三个维度对这些过程进行区分和区分。 LabDCT可以量化颗粒旋转（精确度<0.05°）和晶粒长大，而吸收CT可以同时记录烧结颗粒与扩散和变形相关的形态变化。我们发现，对于较高配位的颗粒，颗粒旋转速率最低，在烧结过程中降低。因此，表面破碎粒子的旋转比内部协调性更高的粒子更大。滚动（合作）和滑动粒子旋转都可以观察到。通过跟踪单个晶粒，烧结过程中晶粒的生长/收缩动力学首次被逐个晶粒地量化。观察到一种谷物快速，异常地生长，而其他谷物则生长或被逐渐消耗。

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