Version 1
: Received: 20 January 2021 / Approved: 21 January 2021 / Online: 21 January 2021 (14:19:33 CET)
How to cite:
Staab, T.; Helm, R.; Diegeler, A. On the Role of Grain Boundaries During Sintering. Preprints2021, 2021010422. https://doi.org/10.20944/preprints202101.0422.v1
Staab, T.; Helm, R.; Diegeler, A. On the Role of Grain Boundaries During Sintering . Preprints 2021, 2021010422. https://doi.org/10.20944/preprints202101.0422.v1
Staab, T.; Helm, R.; Diegeler, A. On the Role of Grain Boundaries During Sintering. Preprints2021, 2021010422. https://doi.org/10.20944/preprints202101.0422.v1
APA Style
Staab, T., Helm, R., & Diegeler, A. (2021). On the Role of Grain Boundaries During Sintering<strong> </strong>. Preprints. https://doi.org/10.20944/preprints202101.0422.v1
Chicago/Turabian Style
Staab, T., Ricardo Helm and Andreas Diegeler. 2021 "On the Role of Grain Boundaries During Sintering<strong> </strong>" Preprints. https://doi.org/10.20944/preprints202101.0422.v1
Abstract
We present new results in positron annihilation lifetime spectroscopy (PALS), thermo-optical dilatometry and microscopy, which are indicating a strong correlation between grain-boundaries and mass transport during the sintering process of carbonyl iron powder. In this particular system we were able to show that the change in particle shape and size with increasing temperature yields an anisotropy in shrinkage, which manifests itself in a higher shrinkage perpendicular to the compaction axis. In the intermediate stage of sintering, where the major mass transport occurs, the average distance between two grain boundaries could be determined to (3,73 ± 0,18) μm at T = 744°C. This is in good agreement with previous calculations of positron pathways in defect free particles. Furthermore, due to sintering temperatures far above the annealing temperature of dislocations in iron, the existence of dislocations in the bulk of the particles is very unlikely. These claims are reflected by the collected positron data, which exhibit a clear grain boundary signal of ∼ 250ps while no vacancy or dislocation signal (typically ∼ 160 ps) is evident in the intermediate stage of sintering.
Keywords
Grain Boundaries
Subject
Chemistry and Materials Science, Chemical Engineering
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
