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2002 | 102 | 2 | 187-192
Article title

Fabrication, Structure and Consolidation of NiAl-Al_2O_3 Mechanically Alloyed Nanocomposite Powders

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Languages of publication
EN
Abstracts
EN
Reactive milling of NiO + Al powder mixture resulted in the formation of NiAl-Al_2O_3 nanocomposite powders, with a crystallite size of about 20 nm. The Hall-Williamson analysis revealed that NiAl showed an orientation dependent crystallite size after short processing time and orientation dependent internal strain after long milling time. Both anisotropies were removed by heating the powders in the differential scanning calorimetry. Calorimetric studies showed one exothermic effect attributed to the reduction reaction of NiO and endothermic one associated with melting of Al. Two methods were applied for powders compaction: resistance sintering and pulse electric discharge. In both cases the densities of about 90% of the theoretical value were achieved. A significant increase in average NiAl crystallites size in compacted samples was observed, up to several hundreds of nanometers.
Keywords
EN
Publisher

Year
Volume
102
Issue
2
Pages
187-192
Physical description
Dates
published
2002-08
received
2001-09-23
Contributors
author
  • Faculty of Materials Science and Engineering, Warsaw University of Technology, Wołoska 141, 02-507 Warszawa, Poland
author
  • Faculty of Materials Science and Engineering, Warsaw University of Technology, Wołoska 141, 02-507 Warszawa, Poland
author
  • Department of Armament and Aviation, Military University of Technology, Kaliskiego 2, 00-908 Warsaw, Poland
References
  • 1. P.G. McCormick, Mater. Trans. Jpn. Inst. Metals, 36, 161, 1995
  • 2. P. Matteazzi, G. Le Caer, Mater. Sci. Eng. A, 156, 229, 1992
  • 3. L. Froyen, in: Proc. Int. Conf. Light Alloys and Composites, May 1999, Zakopane, Poland, Eds. J. Dutkiewicz, S. Pietrowski, Lodart, Łódź 1999, p. 15
  • 4. G.K. Williamson, W.H. Hall, Acta Met., 1, 22, 1953
  • 5. D.G. Morris, A. Benghalem, Mater. Sci. Forum, 179-181, 11, 1995
Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv102n205kz
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