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. |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
The role of the activator rich-W interboundary layer on liquid phase sintering of W-pre-alloy bronze composites of Fe and Co additions -abstract-.pdf | 11.16 kB | Adobe PDF | View/Open |
Items in UniMAP Library Digital Repository are protected by copyright, with all rights reserved, unless otherwise indicated.