Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 560, Issue -, Pages 596-600Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2012.10.001
Keywords
Mechanical characterization; Ceramics; Composites; Intermetallics; Hardening
Categories
Funding
- National Natural Science Foundation of China [50971071, 51171065, 50531030]
- National Basic Research Program of China (973 Program) [2012CB619600]
- Research Fund for the Doctoral Program of Higher Education of China [20100061120063]
- Graduate Innovation Fund of Jilin University [20121087]
- Project 985-High Performance Materials of Jilin University
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The TiAl matrix composites reinforced with nano-TiB2 and nano-Ti5Si3 particles were successfully fabricated by the in situ method of combustion synthesis and hot press consolidation. The sizes of the synthesized TiB2 and Ti5Si3 particles are about 30-50 nm and 60-80 nm, respectively. The synthesized nano-TiB2 particles could significantly enhance the ultimate compression strength (sigma(UCS)(true)) of the TiAl alloy, and the sigma(UCS)(true) increases with the increase in the TiB2 content. The average sigma(UCS)(true) of the 6 vol% TiB2/TiAl composite is 477 MPa higher than that of the TiAl alloy. The synthesized nano-Ti5Si3 particles could improve the strength and ductility of the TiAl alloy simultaneously, and the sigma(UCS)(true) and fracture strain (epsilon(f)(true)) increase first and then decrease with the increase in the Ti5Si3 content. The average sigma(UCS)(true) of the 4 vol% Ti5Si3/TiAl composite is 171 MPa higher than that of the TiAl alloy, and the average epsilon(f)(true) increases from 17.3% to 20.9%. (C) 2012 Elsevier B.V. All rights reserved.
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