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mechanical-alloying--ma
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Hot workability of ultrafine-grained aluminum alloy produced by severe plastic deformation of Al6063 powder and consolidation [electronic resource]
, Article Materials Science Forum ; Volume 667-669, 2011, Pages 979-984 ; Simchi, A. (Abdolreza) ; Seop Kim, Hyoung ; Sharif University of Technology
Abstract
Al6063 powder was subjected to severe plastic deformation via high-energy mechanical milling to prepare ultrafine-grained (UFG) aluminium alloy. Uniaxial compression test at various temperatures between 300 and 450 °C and strain rates between 0.01 and 1 s-1 was carried out to evaluate hot workability of the material. Microstructural studies were performed by EBSD and TEM. The average activation energy and strain rate sensitivity of the hot deformation process were determined to be 280 kJ mol-1 and 0.05, respectively. The deformation temperature and applied strain rate significantly affected the grain structure of UFG Al alloy. A finer grain structure was obtained at lower temperatures and...
Solid state and liquid phase sintering of mechanically activated W-20 wt.% Cu powder mixture
, Article Journal of Alloys and Compounds ; Volume 463, Issue 1-2 , 8 September , 2008 , Pages 153-159 ; 09258388 (ISSN) ; Simchi, A ; Sharif University of Technology
2008
Abstract
W-20 wt.% Cu powder mixture was mechanically alloyed by high-energy ball milling for various times and the effect of mechanical alloying (MA) on the sintering response of the composite compacts was investigated. The densification, microstructure, hardness and electrical conductivity after solid phase sintering (SPS) and liquid phase sintering (LPS) were examined. It was shown that the microstructure of mechanically alloyed powder profoundly influence the sintering response, i.e. a meaningful relationship between the sintering kinetics and the milling time was observed. It is suggested that MA disintegrates the W-W particle networks and increases the contribution of solid phase sintering...