Effect of Mo on the Microstructural Evolution and Mechanical Property Optimization of Novel Ti-15Zr-xMo Biomedical Alloys

Siyuan Zhao; Honglei Zhou

doi:10.6919/ICJE.202504_11(4).0053

Effect of Mo on the Microstructural Evolution and Mechanical Property Optimization of Novel Ti-15Zr-xMo Biomedical Alloys

Siyuan Zhao, Honglei Zhou

International Core Journal of Engineering, (2025), Vol.11, No.4, pp.451-462

Published: March 19, 2025

DOI: 10.6919/ICJE.202504_11(4).0053

PDF: Download Full Text PDF

Abstract

In this study, the crystal structure, microstructure and mechanical properties of new Ti-15Zr-xMo (x = 0, 5, 10, 15, 20 wt.%) alloys at different molybdenum (Mo) contents were systematically investigated. The alloys were prepared by vacuum non-self-consuming electrode arc melting furnace and the samples were processed by hot rolling and heat treatment. The physical phase, microstructure and microstructure were characterized by X-ray diffractometer (XRD), transmission electron microscope (TEM) and optical microscope (OM), respectively; meanwhile, the mechanical properties, Vickers hardness and elastic modulus of the alloys were measured by an electronic universal materials testing machine, microhardness tester and ultrasonic echoes characterization system, respectively.The experimental results showed that Mo element significantly affected the microstructure of Ti-15Zr-xMo alloys.0Mo alloys were mainly composed of α′phase, whereas α″phase and β-phase appeared in 5Mo alloys with the increase of Mo content, 10Mo alloys were composed of α″phase and β-phase together, and 15Mo and 20Mo alloys were completely transformed to a single β-phase.The incorporation of Mo promoted the fine-grain strengthening and solid solution strengthening, the tensile strength of 10Mo alloy reaches 920 MPa, and the tensile strength of 15Mo alloy is 790 MPa, with a maximum elongation of 15%, showing excellent strong plasticity matching. 15Mo alloy has moderate hardness and lowest elastic modulus due to the stabilization of the β-phase, which is more in line with the requirements of the implant materials for high strength, high plasticity and low modulus.

Keywords: Ti Alloys; Biomaterial; Microstructure Evolution; Mechanical Properties; Elastic Modulus.

APA Citation: Siyuan Zhao, Honglei Zhou (2025). Effect of Mo on the Microstructural Evolution and Mechanical Property Optimization of Novel Ti-15Zr-xMo Biomedical Alloys. International Core Journal of Engineering, 11(4), 451-462. https://doi.org/10.6919/ICJE.202504_11(4).0053

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