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Journal of Nanomaterials
Volume 2011 (2011), Article ID 793135, 5 pages
http://dx.doi.org/10.1155/2011/793135
Research Article

Mechanochemical Synthesis and Rapid Consolidation of Nanocrystalline 3NiAl- Composites

1Division of Advanced Materials Engineering and Research Center of Advanced Materials Development, Engineering College, Chonbuk National University, Chonbuk 561-756, Republic of Korea
2Department of Hydrogen and Fuel Cells Engineering, Specialized Graduate School, Chonbuk National University, Chonbuk 561-756, Republic of Korea
3Advanced Functional Materials Research Center, Korea Institute of Science and Technology, P.O. Box 131, Cheongryang, Seoul 130-650, Republic of Korea

Received 20 July 2011; Accepted 30 September 2011

Academic Editor: Claude Estournes

Copyright © 2011 In-Jin Shon et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Nanopowders of 3NiAl and Al2O3 were synthesized from 3NiO and 5Al powders by high-energy ball milling. Nanocrystalline Al2O3 reinforced composite was consolidated by high-frequency induction-heated sintering within 3 minutes from mechanochemically synthesized powders of Al2O3 and 3NiAl. The advantage of this process is that it allows very quick densification to near theoretical density and inhibition grain growth. Nanocrystalline materials have received much attention as advanced engineering materials with improved physical and mechanical properties. The relative density of the composite was 97%. The average Vickers hardness and fracture toughness values obtained were 804 kg/mm2 and 7.5 , respectively.