期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 464, 期 1-2, 页码 138-145出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2007.09.106
关键词
intermetallics; laser processing; microstructure; oxidation
资金
- National Natural Science Foundation of China [50625413, 50331010]
- Innovation Foudation of BUAA
Ti-Co-Si ternary intermetallic alloys with Ti5Si3 as the main reinforcing phase and intermetallic TiCo as the toughening matrix were fabricated by the laser-melting deposition (LMD) process. Microstructure of the intermetallic alloys was characterized by OM, SEM, XRD and EDS. High-temperature oxidation resistance of the alloys was evaluated by isothermal oxidation at 1173 K and metallic dry-sliding wear property was evaluated at room temperature. The effect of reinforcing phase Ti5Si3 content oil hardness, oxidation and wear resistance of the alloys was investigated. Results indicate that microstructure of the alloys transforms front hypocutectic to hypercutectic, while hardness and oxidation resistance increases with the increasing Ti5Si3 content. The alloys have good oxidation resistance at 1173 K and the oxidation kinetic curves tire approximately parabolic. Wear resistance of the alloys is insensitive to the microstructure and is up to 15-19 times higher than the hardened toot steel 1.0%C-1.5%Cr under dry-sliding wear test conditions. The excellent wear resistance of alloys is attributed to the effective reinforcement of Ti5Si3 and the excellent toughness of the intermetallic TiCo. (C) 2007 Published by Elsevier B. V.
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