On sinterability of nanostructured W produced by high energy ball milling

Malewar, R. ; Kumar, K. S. ; Murty, B. S. ; Sarma, B. ; Pabi, S. K. (2011) On sinterability of nanostructured W produced by high energy ball milling Journal of Materials Research, 22 (5). pp. 1200-1206. ISSN 0884-2914

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Official URL: http://journals.cambridge.org/action/displayAbstra...

Related URL: http://dx.doi.org/10.1557/jmr.2007.0166

Abstract

The present investigation reports for the first time a dramatic decrease in the sintering temperature of elemental W from the conventional temperature of ≥2500 ° C to the modest temperature range of 1700-1790 ° C by making the W powder nanostructured through high-energy mechanical milling (MM) prior to sintering. The crystallite size of the initial W powder charge with a particle size of 3-4 µm could be brought down to 8 nm by MM for 5 h in WC grinding media. Further milling resulted in a high level of WC contamination, which apparently was due to work hardening and the grain refinement of W. A sintered density as high as 97.4% was achieved by sintering cold, isostatically pressed nanocrystalline (8 nm) W powder at 1790 ° C for 900 min. The microstructure of the sintered rods showed the presence of deformation bands, but no cracks, within a large number of W grains. The mechanical properties, when compared with the hardness and elastic modulus, of the sintered nano-W specimen were somewhat superior to those reported for the conventional sintered W.

Item Type:Article
Source:Copyright of this article belongs to Cambridge University Press.
Keywords:Nanostructure; Sintering; W
ID Code:64035
Deposited On:04 Oct 2011 08:43
Last Modified:04 Oct 2011 08:43

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