Tlotleng, MonnammeMasina, Bathusile NPityana, Sisa L2017-06-072017-06-072017-01Tlotleng, M., Masina, B. and Pityana, S.L. 2017. Characteristics of laser In-situ alloyed titanium aluminides coatings. International Conference on Sustainable Materials Processing and Manufacturing, SMPM 2017, 23-25 January 2017, Kruger National Park, South Africa. In: Procedia Manufacturing, vol. 7: 39-45. https://doi.org/10.1016/j.promfg.2016.12.0132351-9789http://www.sciencedirect.com/science/article/pii/S2351978916301767#https://doi.org/10.1016/j.promfg.2016.12.013http://hdl.handle.net/10204/9112© 2017 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND licenseThe use of titanium aluminides as high temperature materials in the aerospace and automobile industries is becoming a reality since their early research and development in 1955. Their mechanical properties at elevated temperatures make them attractive in spite of their poor ductility at room temperature. The progress on their production using powder metallurgy processes seem to be significantly positive; at least on microstructure tailoring and mechanical properties. This research work sought to study the in-situ alloying of the elemental Ti and Al using laser metal deposition (LMD) process. The effects of laser power on the microstructure evolution, composition and micro-hardness were evaluated on the as-produced TiAl coatings. The results indicated that lamellar microstructures formed at 1.0, 1.3 and 1.5 kW laser powers while at 2.0 kW a refined dendritic structure was observed. The phase composition by XRD concluded the presence of TiAl(sub3), TiAl, Ti(sub3)Al(sub5), and the oxide phases of Ti and Al. Generally, the Ti(sub3)Al(sub5) phase is indicative of high temperature process during TiAl processing while TiAl(sub3) is known as a twinning phase to TiAl. The average HV(sub0.3) values for 1.0, 1.3, 1.5 and 2.0 kW coatings were 327(sub0.3), 281(sub0.3), 333(sub0.3) and 367(sub0.3), respectively. These hardness values are indicative of the presence of TiAl/TiAl(sub3).enHardnessHeat-inputLaser-powerMicrostructuresTitanium aluminidesTiAlsX-ray diffractionXRDConference PresentationTlotleng, M., Masina, B. N., & Pityana, S. L. (2017). Characteristics of laser In-situ alloyed titanium aluminides coatings. Elsevier. http://hdl.handle.net/10204/9112Tlotleng, Monnamme, Bathusile N Masina, and Sisa L Pityana. "Characteristics of laser In-situ alloyed titanium aluminides coatings." (2017): http://hdl.handle.net/10204/9112Tlotleng M, Masina BN, Pityana SL, Characteristics of laser In-situ alloyed titanium aluminides coatings; Elsevier; 2017. http://hdl.handle.net/10204/9112 .TY - Conference Presentation AU - Tlotleng, Monnamme AU - Masina, Bathusile N AU - Pityana, Sisa L AB - The use of titanium aluminides as high temperature materials in the aerospace and automobile industries is becoming a reality since their early research and development in 1955. Their mechanical properties at elevated temperatures make them attractive in spite of their poor ductility at room temperature. The progress on their production using powder metallurgy processes seem to be significantly positive; at least on microstructure tailoring and mechanical properties. This research work sought to study the in-situ alloying of the elemental Ti and Al using laser metal deposition (LMD) process. The effects of laser power on the microstructure evolution, composition and micro-hardness were evaluated on the as-produced TiAl coatings. The results indicated that lamellar microstructures formed at 1.0, 1.3 and 1.5 kW laser powers while at 2.0 kW a refined dendritic structure was observed. The phase composition by XRD concluded the presence of TiAl(sub3), TiAl, Ti(sub3)Al(sub5), and the oxide phases of Ti and Al. Generally, the Ti(sub3)Al(sub5) phase is indicative of high temperature process during TiAl processing while TiAl(sub3) is known as a twinning phase to TiAl. The average HV(sub0.3) values for 1.0, 1.3, 1.5 and 2.0 kW coatings were 327(sub0.3), 281(sub0.3), 333(sub0.3) and 367(sub0.3), respectively. These hardness values are indicative of the presence of TiAl/TiAl(sub3). DA - 2017-01 DB - ResearchSpace DP - CSIR KW - Hardness KW - Heat-input KW - Laser-power KW - Microstructures KW - Titanium aluminides KW - TiAls KW - X-ray diffraction KW - XRD LK - https://researchspace.csir.co.za PY - 2017 SM - 2351-9789 T1 - Characteristics of laser In-situ alloyed titanium aluminides coatings TI - Characteristics of laser In-situ alloyed titanium aluminides coatings UR - http://hdl.handle.net/10204/9112 ER -