Articles
  • Mechanochemical synthesis and rapid sintering of nanocrystalline AlCr2-2Al2O3 composite and its mechanical properties
  • Jin-Kook Yoona and In-Jin Shonb,*
  • a Materials Architecturing Research Center, Korea Institute of Science and Technology, PO Box 131, Cheongryang, Seoul 130-650, Korea b Division of Advanced Materials Engineering, the Research Center of Hydrogen Fuel Cell, Chonbuk National University, 664-14 Deokjin-dong l-ga, Deokjin-gu, Jeonju, Jeonbuk 56-756, Korea
Abstract
Nanopowders of AlCr2 and Al2O3 were synthesized during high energy ball milling. Densely nanostructured AlCr2-2Al2O3 composite was consolidated by high-frequency induction heated sintering within 2 min from milled powders. Highly dense AlCr2-2Al2O3 composite with relative density of up to 96% was produced under application of a 80 MPa pressure and the induced current. The fracture toughness of a AlCr2-Al2O3 composite in this study is similar to that of previous study, while the hardness of a AlCr2-Al2O3 composite in this study is better than that of previous study due to the grain refinement. The fracture toughness of AlCr2-2Al2O3 composite is higher than that of pure Al2O3. The microstructure and mechanical properties were investigated using FE-SEM with EDS and Vickers hardness tester.

Keywords: Sintering, Hardness, Nanocrystalline, Fracture toughness, Synthesis.

This Article

  • 2016; 17(8): 876-880

    Published on Aug 31, 2016