首页> 外文期刊>The Journal of Strain Analysis for Engineering Design >Combining X-ray microtomography and three-dimensional digital volume correlation to track microstructure evolution during sintering of copper powder
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Combining X-ray microtomography and three-dimensional digital volume correlation to track microstructure evolution during sintering of copper powder

机译:结合X射线显微断层照相术和三维数字体积相关性来跟踪铜粉烧结过程中的微观结构演变

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Optimising the manufacture, and ultimately the mechanical performance, of powder-processed components requires an understanding of how the state of the material evolves during processing and in particular during the final sintering stage. Synchrotron X-ray microtomography has been employed to follow in situ the evolution of particle microstructure during sintering of copper powder. In particular, three-dimensional digital volume correlation of a time-lapse computed tomography image sequence allows accurate quantification of the three-dimensional movements of the particles and thereby local strain for the first time. Strains are quantified both at a coarse scale across the whole powder assembly and at higher magnification for a smaller local region of interest. Unsurprisingly, the rate of shrinkage is observed to decrease with sintering time in accordance with changes in the overall density. Heterogeneities in straining within the body are observed at the several particle level, often associated with anisotropic shrinkage in part associated with non-uniform movement and densification of small aggregates of particles between which significant changes in shrinkage are observed. These differences in shrinkage could be responsible for cracking on further densification.
机译:优化粉末加工部件的制造,并最终优化机械性能,需要了解材料状态在加工过程中,尤其是在最终烧结阶段如何演变。同步加速器X射线显微照相术已被用于原位跟踪铜粉烧结过程中颗粒微观结构的演变。特别地,延时计算机断层扫描图像序列的三维数字体积相关性允许对粒子的三维运动进行精确量化,从而首次实现局部应变。在整个粉末组件上以较粗的比例对菌株进行定量,并在较小的局部感兴趣区域以较高的倍率对菌株进行定量。毫不奇怪,观察到收缩率随烧结时间的延长而降低,这与总密度的变化有关。在几个颗粒水平上观察到体内应变的不均匀性,通常与各向异性收缩有关,部分与不均匀的运动和小颗粒聚集体的致密化有关,在此之间观察到收缩的显着变化。收缩率的这些差异可能是造成进一步致密化的原因。

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