Please use this identifier to cite or link to this item: http://dspace.unimap.edu.my:80/xmlui/handle/123456789/27306
Title: The role of the activator rich-W interboundary layer on liquid phase sintering of W-pre-alloy bronze composites of Fe and Co additions
Authors: Kahtan S, Muhammed, Dr.
Azmi, Rahmat, Prof.
kahtan@unimap.edu.my
azmirahmat@unimap.edu.my
Keywords: Activated sintering
Grain boundary
Interboundary layer
Tungsten-bronze composites
Issue Date: Nov-2012
Publisher: Elsevier B.V.
Citation: International Journal of Refractory Metals and Hard Materials, vol. 35, 2012, pages 170-177
Abstract: In this study, the effects of 1-3 wt.% Fe and Co additions on the sintering of W 40-80wt.%-pre-alloy bronze Sn 10 wt.%-Cu compacts were examined. The isothermal part of the sintering process was conducted at temperatures ranging from 920 °C to 1300 °C for 3 h. Relative sintered densities in the range of 70-90% were achieved. The gain in the sintered densities due to activator addition was 5-15%. The sintering activation effects started at temperatures as low as 600 °C below the bulk eutectic temperature. SEM, XRD and EDX tests proved that Fe and Co-rich crystalline interboundary layers completely wet the tungsten grain boundaries in the solid state and act as a short-circuit diffusion path for mass transportation. These outcomes seem to follow the classical activated sintering model and contrast with some other recently proposed models, whereby a detected nanometer-thick, activator-enriched disordered film at W grain boundary is considered fully responsible for the solid-state activated sintering.
Description: Link to publisher's homepage at http://www.elsevier.com/
URI: http://dspace.unimap.edu.my/123456789/27306
ISSN: 0263-4368
http://www.sciencedirect.com/science/article/pii/S0263436812000935#
Appears in Collections:School of Materials Engineering (Articles)
Kahtan Sadiq Muhammed, Dr.
Azmi, Rahmat, Assoc. Prof. Dr.



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