Microstructure and bending properties of solution-treated Ti-Mo binary alloys for biomedical applications

¹ Advance Materials Engineering, Manufacturing Cluster, Council for Scientific and Industrial Research, Meiring Naudé Road, Brummeria, Pretoria 0184, South Africa
² Department of Metallurgy, School of Mining and Metallurgy and Chemical Engineering, University of Johannesburg, Doornfontein Campus, Johannesburg, South Africa
³ Department of Chemical, Materials and Metallurgical Engineering, Botswana International University of Science and Technology, Plot 10071 Boseja, Palapye, Botswana

Abstract

The current study investigates the influence Mo on the microstructure and bending properties of solution treated Ti-xMo alloys (x= 10.00, 12.89, and 15.05 wt%). The fundamental objective of the study is to attain the correlation between the composition, processing, microstructure, and bending properties of β Ti after the solution treatment process. The alloys were fabricated using the commercially available arc melting furnace, they were subjected to solution treatment at a temperature of 1100 ℃ for 1hr and quenched in ice water. X-ray diffractometer showed peaks belonging to β and αʺ phase for all the solution treated alloys, while the microstructures of all the alloys characterized by Optical microscope illustrated equiaxed β grains structure and sub-grain structures belonging to the αʺ structure. The highest bending strength was found to be 1627.40 Mpa when the Mo content was 15wt%. The bending modulus decreased significantly with an increase in composition. The lowest bending modulus of 74 GPa was seen in 15.05wt% Mo alloy. The Micro-Vickers Hardness of the designed alloys increased extensively with an increase in Mo content. The fracture surfaces of the alloys after bending illustrated dimple features and pronounced cleavage facets which indicated brittle and ductile fracture in all the binary alloys.