Recently, the properties of nanostructured materials as advanced engineering materials have received great attention. These properties include fracture toughness and a high degree of hardness. To hinder grain growth during sintering, it is necessary to fabricate nanostructured materials. In this respect, a high-frequency induction-heated sintering method has been presented as an effective technique for making nanostructured materials at a lower temperature in a very short heating period. Nanopowders of W and Al2O3 are synthesized from WO3 and Al powders during high-energy ball milling. Highly dense nanostructured W-Al2O3 composites are made within three minutes by high-frequency induction-heated sintering method and materials are evaluated in terms of hardness, fracture toughness, and microstructure. The hardness and fracture toughness of the composite are 1364 kg/mm2 and 7.1 MPa·m1/2, respectively. Fracture toughness of nanostructured W-Al2O3 is higher than that of monolithic Al2O3. The hardness of this composite is higher than that of monolithic W.

Abstract
 1. Introduction
 2. Experimental Procedures
 3. Results and Discussion
 4. Conclusions
 References

• BooRak Lee(Department of Advanced Materials Engineering, Korea Polytechnic University)
• GeolChae Jeong(Department of Advanced Materials Engineering, Korea Polytechnic University, GyeongGi-Do)
• GeunO Park(Division of Advanced Materials Engineering, the Research Center of Hydrogen Fuel Cell, Chonbuk National University)
• In-Jin Shon(Division of Advanced Materials Engineering, the Research Center of Hydrogen Fuel Cell, Chonbuk National University) Corresponding author