Microstructural evolution during sintering of copper particles studied by laboratory diffraction contrast tomography (LabDCT)

Microstructural evolution during sintering of copper particles studied by laboratory diffraction contrast tomography (LabDCT)

Abstract 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...

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Autores principales: S. A. McDonald, C. Holzner, E. M. Lauridsen, P. Reischig, A. P. Merkle, P. J. Withers
Formato: article
Lenguaje:EN
Publicado: Nature Portfolio 2017
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Acceso en línea:https://doaj.org/article/d125d685a443481fb3138a72951cb1b2
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spelling oai:doaj.org-article:d125d685a443481fb3138a72951cb1b22021-12-02T16:07:47ZMicrostructural evolution during sintering of copper particles studied by laboratory diffraction contrast tomography (LabDCT)10.1038/s41598-017-04742-12045-2322https://doaj.org/article/d125d685a443481fb3138a72951cb1b22017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-04742-1https://doaj.org/toc/2045-2322Abstract 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.S. A. McDonaldC. HolznerE. M. LauridsenP. ReischigA. P. MerkleP. J. WithersNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-11 (2017)
institution DOAJ
collection DOAJ
language EN
topic Medicine
R
Science
Q
spellingShingle Medicine
R
Science
Q
S. A. McDonald
C. Holzner
E. M. Lauridsen
P. Reischig
A. P. Merkle
P. J. Withers
Microstructural evolution during sintering of copper particles studied by laboratory diffraction contrast tomography (LabDCT)
description Abstract 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.
format article
author S. A. McDonald
C. Holzner
E. M. Lauridsen
P. Reischig
A. P. Merkle
P. J. Withers
author_facet S. A. McDonald
C. Holzner
E. M. Lauridsen
P. Reischig
A. P. Merkle
P. J. Withers
author_sort S. A. McDonald
title Microstructural evolution during sintering of copper particles studied by laboratory diffraction contrast tomography (LabDCT)
title_short Microstructural evolution during sintering of copper particles studied by laboratory diffraction contrast tomography (LabDCT)
title_full Microstructural evolution during sintering of copper particles studied by laboratory diffraction contrast tomography (LabDCT)
title_fullStr Microstructural evolution during sintering of copper particles studied by laboratory diffraction contrast tomography (LabDCT)
title_full_unstemmed Microstructural evolution during sintering of copper particles studied by laboratory diffraction contrast tomography (LabDCT)
title_sort microstructural evolution during sintering of copper particles studied by laboratory diffraction contrast tomography (labdct)
publisher Nature Portfolio
publishDate 2017
url https://doaj.org/article/d125d685a443481fb3138a72951cb1b2
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