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Microhardness and wear behaviour of surface modified Ti6Al4V/Zr-TiC metal matrix composite for advanced material

A.P. I. POPOOLA1,* , O. F. OCHONOGOR1, M. ABDULWAHAB1, S. PITYANA1,2, C. MEACOCK2

Affiliation

  1. Department of Chemical and Metallurgical Engineering, Faculty of Engineering and the Built Environment, Tshwane University of Technology, P.M.B. X680, Pretoria, South Africa 0001
  2. Council for Scientific and Industrial Research, National Laser Centre, Pretoria, South Africa

Abstract

Surface modification of titanium alloy (Ti-6Al-4V) was made using a Rofin Sinar 4 kW Nd: YAG laser. A laser multi-track 50% overlapping process was employed to produce Zr and Zr-TiC metal matrix composite (MMC) coatings on Ti6Al4V substrate. The beam diameter was set at 4 mm. The microstructures of fabricated composites consist of homogeneous distribution of TiC particles which were free of cracks with x-ray diffraction (XRD) analyses indicating formation of interstitial carbides. Multilayer cladding involving Ti6Al4V + (100%Zr and Ti6Al4V + (Zr+TiC) MMCs fabricated with 10, 20, 30 and 40 %TiC were developed. Multiple track deposited samples revealed microhardness improvement as high as 1048.7 HV for 60%Zr+40%TiC MMC and the least hardness displayed is 606.6 HV for 90%Zr+10%TiC MMC. The wear result showed that the developed MMCs have low wear rate as compared to the substrate..

Keywords

Laser cladding, metal matrix composites, Ti6Al4V, rapid solidification, interstitial carbides, Biomedical.

Submitted at: April 27, 2012
Accepted at: Oct. 30, 2012

Citation

A.P. I. POPOOLA, O. F. OCHONOGOR, M. ABDULWAHAB, S. PITYANA, C. MEACOCK, Microhardness and wear behaviour of surface modified Ti6Al4V/Zr-TiC metal matrix composite for advanced material, Journal of Optoelectronics and Advanced Materials Vol. 14, Iss. 11-12, pp. 991-997 (2012)