A binary Ti-Si (1 : 1) alloy coating was fabricated on Ti-6Al-4V alloy using laser cladding technique where Neodymium yttrium aluminium garnet laser was utilised. Micro-atomised powders of Ti and Si were used for deposition of multi-track clad coatings utilising power of 1.5 kW and a varied speed of 1.2 m/min, 1.6 m/min and 2.0 m/min. Scanning electron microscope coupled with energy dispersive spectrometer was used for microstructural characterisation and elemental analysis while a digital light microscope was used for optical imaging and coating thickness measurements. Phase identification was conducted using X-ray diffraction analyser and transverse microhardness evaluated at 100 gf for 10 s dwell time was achieved with the use of a Vickers hardness machine. The laser fabricated coatings were found to exhibit a decrease in grain size with an increase in the laser scanning speed. The microstructure of the coatings ranged from irregular refined grains, faceted grains and lamellar eutectic network of TiSS + Ti5Si3. The hardness of the coatings exhibited Ti, Si, TiS2 and Ti5Si3 phases averaged a 247.4% increase with maximum hardness recorded at 1.2 m/min scanning speed.
Reference:
Phala, M.F. et al. 2018. Effect of laser scanning speed on surface properties of Ti-Si laser clad intermetallic coatings fabricated on Ti-6Al-4V alloy. International Journal of Microstructure and Materials Properties, vol. 13(5): https://doi.org/10.1504/IJMMP.2018.097217
Phala, M., Popoola, A., Tlotleng, M., & Pityana, S. L. (2018). Effect of laser scanning speed on surface properties of Ti-Si laser clad intermetallic coatings fabricated on Ti-6Al-4V alloy. http://hdl.handle.net/10204/10839
Phala, MF, API Popoola, Monnamme Tlotleng, and Sisa L Pityana "Effect of laser scanning speed on surface properties of Ti-Si laser clad intermetallic coatings fabricated on Ti-6Al-4V alloy." (2018) http://hdl.handle.net/10204/10839
Phala M, Popoola A, Tlotleng M, Pityana SL. Effect of laser scanning speed on surface properties of Ti-Si laser clad intermetallic coatings fabricated on Ti-6Al-4V alloy. 2018; http://hdl.handle.net/10204/10839.
Copyright: 2018 Inderscience. Due to copyright restrictions, the attached PDF file contains the accepted version of the published article. For access to the published version, please consult the publisher's website: https://www.inderscienceonline.com/doi/abs/10.1504/IJMMP.2018.097217