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Grain boundary segregation in sintered materials: Effect on densification and grain growth

: Lay, Sabine; Guyon, Audrey; Chaix, Jean-Marc; Carry, Claude; Pötschke, Johannes

Fulltext urn:nbn:de:0011-n-4212611 (907 KByte PDF)
MD5 Fingerprint: 032474b1aa0cd0e2e246ac00dacfb73c
Created on: 15.11.2016

European Powder Metallurgy Association -EPMA-:
World PM 2016 Congress & Exhibition. USB Proceedings : The Powder Metallurgy World Congress, Hamburg, 9.-13.10.2016
Shrewsbury: EPMA, 2016
ISBN: 978-1-899072-48-4
6 pp.
Powder Metallurgy World Congress & Exhibition (PM) <2016, Hamburg>
Conference Paper, Electronic Publication
Fraunhofer IKTS ()
grain boundary phase composition; TEM; segregation; WC; ZrO2

Dopants are often included in the composition of powders to elaborate sintered materials. They have various effects as facilitating sintering, improving microstructure, stabilizing crystalline phases or enhancing properties of materials. The exact role of these additives is often not fully understood thus microstructural characterization is required to elucidate this issue, especially the composition of grain boundaries (GB). Two materials are presented in this study: binderless WC with addition of VC or Cr3C2 and Al2O3-ZrO2 composites. In each case, structural and microstructural characterization was performed at different scales. The distribution of V and Cr elements was determined in WC. In the oxides, Y and Zr segregate in GB so the effect of the sintering process - natural or microwave sintering (MWS) - on GB segregation is investigated as MWS is proposed to enhance diffusion. The effect of GB segregation is related to the densification behavior and grain growth in sintered materials.