Journal
SURFACE & COATINGS TECHNOLOGY
Volume 206, Issue 6, Pages 1372-1381Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2011.08.065
Keywords
Titanium; Silicon carbide; Grain boundary; Scanning electron microscopy; Transmission electron microscopy; Vickers hardness test
Funding
- University of Tehran and Iran Nanotechnology Initiative
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Sound friction-stir processed layers were fabricated on a commercially pure titanium substrate with or without introduction of nano-sized SiC powder to the stir zone under an argon shrouding system using tool rotation and substrate advancing speeds in the range 800-1250 rpm and 35-55 mm/s, respectively. Surface layers exhibited finer grain sizes and greater hardness values compared to those of the as-received substrate. Superior surface enhancements were resulted by uniform dispersion of nano-sized SiC powder in the fabricated surface composite layer after four friction stir process passes. The fabricated Ti/SiC nano-composite surface layer showed a matrix of dynamically restorated ultra fine grains/subgrains with a mean size of similar to 400 nm and a hardness value of similar to 534 HV; this is about 33 times greater than that of the as-received substrate. (C) 2011 Elsevier B.V. All rights reserved.
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