1. Mechanochemical Synthesis and Rapid Consolidation of Nanocrystalline 3NiAl-Al2O3Composites
- Author
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Jung-Mann Doh, In-Jin Shon, Sang-Whan Park, Seung-Hoon Jo, Jin-Kook Yoon, and In-Yong Ko
- Subjects
Grain growth ,Fracture toughness ,Materials science ,Vickers hardness test ,Composite number ,Sintering ,Relative density ,General Materials Science ,Composite material ,Ball mill ,Nanocrystalline material - Abstract
Nanopowders of 3NiAl and Al2O3were synthesized from 3NiO and 5Al powders by high-energy ball milling. Nanocrystalline Al2O3reinforced composite was consolidated by high-frequency induction-heated sintering within 3 minutes from mechanochemically synthesized powders of Al2O3and 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/mm2and 7.5 MPa⋅m1/2, respectively.
- Published
- 2011