The effects of friction-stir process parameters on the fabrication of Ti/SiC nano-composite surface layer

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, respectiv...

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Bibliographic Details
Published in:Surface & coatings technology 2011-12, Vol.206 (6), p.1372-1381
Main Authors: Shamsipur, Ali, Kashani-Bozorg, Seyed Farshid, Zarei-Hanzaki, Abbas
Format: Article
Language:English
Subjects:
Applied sciences
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Grain boundary
Grain size
Hardness
Materials science
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Nanocomposites
Nanomaterials
Nanostructure
Physics
Scanning electron microscopy
Silicon carbide
Surface layer
Surface treatments
Titanium
Transmission electron microscopy
Vickers hardness test
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Summary: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 ~ 400 nm and a hardness value of ~ 534 HV; this is about 3.3 times greater than that of the as-received substrate. ► Ti/SiC composite layers were fabricated on CP-Ti by friction-stir processing. ► Uniform dispersion of nano-sized SiC was achieved after four passes. ► The nano-composite layer showed a matrix of ultra fine dynamically restorated grains. ► The nano-composite layer with uniform SiC dispersion exhibited superior hardness. ► Superior hardness was related to nano-sized SiC and its role on grain boundary pinning.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2011.08.065