Design and strengthening behaviour of Ti2AlC/TiAl composite by low-temperature hot-pressing process. (18th May 2016)

• Record Type: Journal Article
• Authors: Ai, T.; Yu, Q.; Li, W.
• Is Part Of: Advances in applied ceramics. Volume 115:Number 4(2016)
• Page Start: 190
• Page End: 192
• Publication Date: 2016-05-18
• Subjects: Intermetallics -- Crack propagation -- Reaction synthesis -- Microstructure -- Mechanical properties; Ceramics -- Periodicals; 620.1405
• DOI: 10.1080/17436753.2015.1104054
• Languages: English
• ISSNs: 1743-6753

Abstract

Abstract : In situ Ti2 AlC/TiAl composite was first fabricated by reactive hot-pressing technique at low temperature of 1150°C for 2 h using Ti3 AlC2 and Ti–Al alloy powders. The composite with fine-grained structure consisted of TiAl, Ti3 Al and Ti2 AlC phases. The Vickers hardness, flexural strength and fracture toughness of the Ti2 AlC/TiAl composite reached 5.2 GPa, 937.7 MPa and 7.7 MPa m 1/2, respectively. The action mechanism for the composite was mainly attributed to the grain refinement, the uniform distribution of the dispersed Ti2 AlC particles, transgranular cracking, crack deflection, crack bridging and pull-out of Ti2 AlC.