Mechanical Strengthening and Microstructural Evolutions of Ni-B Based Hardfacing Alloys Influenced by Titanium Additions
Advances in Materials
Volume 8, Issue 2, June 2019, Pages: 41-47
Received: Jan. 31, 2019; Accepted: Mar. 11, 2019; Published: Apr. 13, 2019
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Zeblon Meshack Ebimobowei, Department of Physics and Engineering Physics, Obafemi Awolowo University, Ile-Ife, Nigeria
Ajenifuja Emmanuel, Centre for Energy Research and Development, Obafemi Awolowo University, Ile-Ife, Nigeria; Department of Chemical, Metallurgical and Materials Engineering, Tshwane University of Technology, Pretoria, South Africa
Ajao John Adegbindin, Centre for Energy Research and Development, Obafemi Awolowo University, Ile-Ife, Nigeria
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The microstructure and mechanical behaviour of Ni-B binary alloys have been enhanced in this study by varied titanium additions. The alloys investigated were chosen from the nickel-rich region of the Ni-B-Ti system. The microstructure of the alloys was examined using Optical Microscope (OM) and Scanning Electron Microscope (SEM) equipped with Energy Dispersive X-ray Analyzer (EDXA). The addition of titanium led to the formation of various complex phases and a ternary phase τ was observed in the study. The addition of titanium to the Ni-B alloys was found to enhance the mechanical properties of the ternary alloys. Microhardness value of the alloys was observed to increase from 216.2 HV with zero Ti in Ni-B alloys to 1530.7 HV in alloys with 11 wt. % Ti. The stiffness of the alloys was also found to increase as deduced from elastic modulus value of 513.77 to 1046.51 N/m2 in Alloys C. Remarkable improvement in physical properties of the Ni-based ternary alloys is due to the formation of various hard boride phases and grain size reduction occasioned by the increase in titanium content.
Ni-B Alloys, Ti Addition, Microstructure, Microhardness, Ternary Alloy, Stiffness
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Zeblon Meshack Ebimobowei, Ajenifuja Emmanuel, Ajao John Adegbindin, Mechanical Strengthening and Microstructural Evolutions of Ni-B Based Hardfacing Alloys Influenced by Titanium Additions, Advances in Materials. Vol. 8, No. 2, 2019, pp. 41-47. doi: 10.11648/
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