Fast consolidation and properties of a nanostructured AlCr2–2Al2O3 composite from mechanochemically synthesized powders by pulsed current activated heating. Issue 5 (April 2016)

• Record Type: Journal Article
• Authors: Kwak, Bong-Won; Shon, In-Jin
• Is Part Of: Ceramics international. Volume 42: Issue 5 (2016)
• Page Start: 6487
• Page End: 6494
• Publication Date: 2016-04
• Subjects: A. Sintering -- B. Composite -- C. Mechanical properties -- Nanostructure -- Synthesis; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2015.12.135
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Nanopowders of AlCr2 and Al2 O3 were fabricated using high-energy ball milling. Dense nanostructured AlCr2 –2Al2 O3 composite was sintered by pulsed current activated heating within 2 min, from mechanically synthesized powders. The advantage of this process is that it allows very quick densification to near-theoretical density and prohibition of grain growth in nanostructured materials. Highly dense AlCr2 –2Al2 O3 composite with a relative density of up to 97% was produced under application of an 80 MPa pressure with the pulsed current. The fracture toughness of the AlCr2 –2Al2 O3 composite of this study is similar to that of a previous study and its hardness is higher due to the grain refinement. The fracture toughness of the AlCr2 –2Al2 O3 composite is higher than that of pure Al2 O3 .