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Metals 2017, 7(2), 33; doi:10.3390/met7020033

The Pseudo-Eutectic Microstructure and Enhanced Properties in Laser-Cladded Hypereutectic Ti–20%Si Coatings

1
School of Materials Science and Engineering, Anhui University of Technology, Ma’anshan 243002, China
2
The Advanced Manufacturing Technology Research Centre, Department of Industrial and Systems Engineering, Hong Kong Polytechnic University, Hung Hom, Hong Kong, China
*
Author to whom correspondence should be addressed.
Academic Editor: Hugo F. Lopez
Received: 30 November 2016 / Revised: 10 January 2017 / Accepted: 20 January 2017 / Published: 26 January 2017
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Abstract

Ti5Si3 is an attractive light weight reinforcement phase in hypereutectic Ti–Si-based alloys, however, the proeutectic Ti5Si3 phase is brittle and is easily coarsened when the alloy is prepared under normal solidification conditions, thereby limiting its engineering applications in the aviation and biological industries. In this study, a hypereutectic Ti–20%Si coating with a pseudo-eutectic α-Ti + Ti5Si3 microstructure was successfully fabricated on a commercially available Ti alloy by laser cladding under non-equilibrium rapid solidification conditions. The fine, rod-like and well-dispersed eutectic Ti5Si3 phase, without the primary Ti5Si3 phase, that was produced resulted in a considerable improvement in hardness, corrosion resistance, and fracture resistance when compared to the same compositional alloy prepared by the conventional arc melting technique. View Full-Text
Keywords: laser cladding; hypereutectic Ti–Si alloy; corrosion; fracture resistance laser cladding; hypereutectic Ti–Si alloy; corrosion; fracture resistance
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Zhang, H.; Zhang, Z.; Yue, T.M. The Pseudo-Eutectic Microstructure and Enhanced Properties in Laser-Cladded Hypereutectic Ti–20%Si Coatings. Metals 2017, 7, 33.

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