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
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.
Zeblon Meshack Ebimobowei,
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.
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