Journal
CERAMICS INTERNATIONAL
Volume 40, Issue 7, Pages 9947-9953Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2014.02.092
Keywords
Mechanical properties; Metal-matrix composites; Particle-reinforcement; Microstructures
Categories
Funding
- National Natural Science Foundation of China [51201094]
- Natural Science Foundation of Shaanxi Province, China [2012JM6018]
- Science and Technology Program for Young Technology New Star of Shaanxi Province, China
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A new dual Ti3AlC2 -Ti2AlC/TiAl composite was in situ synthesized by hot-pressing sintering process at 900 degrees C for 2 h using Ti, Al, and Ti3AlC2 powders as the initial materials. The phases and microstructure of the products were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The influence of Ti3AlC2 content on the mechanical properties of the composites was studied in detail. The composites were composed of TiAl, Ti3Al, Ti3AlC2 and a small amount of Ti2AlC phases. Ti(2)AC phase was mainly produced by the decomposition reaction of Ti3AlC2. The composite with 5 wt% Ti3AlC2 additive exhibited better properties, and the Vickers hardness, three-point flexural strength and fracture toughness were 2.7 GPa, 316 MPa and 7.3 MPa m(1/2), respectively. The toughening of the composite was primarily attributed to crack deflection, transgranular and/or translamellar cracking, pull-out of the carbides reinforcements and cleavage, especially, the combination toughening of Ti3AlC2 and Ti2AlC. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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