Fabrication, Structure and Mechanical and Ultrasonic Properties of Medical Ti6Al4V Alloys Part I: Microstructure and Mechanical Properties of Ti6Al4V Alloys Suitable for Ultrasonic Scalpel

Abstract

Ti6Al4V alloy has been considered as a key component used in ultrasonic scalpels. In this series of papers, the fabrication, structure, and mechanical and ultrasonic properties of medical Ti6Al4V alloys suitable for ultrasonic scalpel are studied systemically. These alloys with low elastic modulus and present a typical bimodal microstructure with relatively high β phase content (~40%) and lamellar α thickness of ≤ 0.9 µm. In the first paper, the relationship between the microstructure and mechanical properties of hot-rolled Ti6Al4V alloys treated by heating treatment is discussed. In the second paper, the dependence of the ultrasonic properties on the microstructure of the heat-treated Ti6Al4V alloys is reported. With increasing solid solution temperature, the content and size of the primary α phase decrease. In contrast, the content and size of the lamellar α phase increase. Additionally, the β phase content first increases and then decreases. The microstructure of Ti6Al4V alloys could be slightly changed by aging treatment. When the solid solution treatment temperature increases to 980 °C from 960 °C, the average size of the lamellar α phase in the alloys increases by 1.1 µm. This results in a decrease in the average yield strength (93 MPa). The elastic modulus of alloys is mainly controlled by the β phase content. The microstructure of alloys by solution-treatment at 960 °C shows the highest β phase content and lowest average elastic modulus of 99.69 GPa, resulting in the minimum resonant frequency (55.06 kHz) and the highest average amplitude (21.48 µm) of the alloys at the length of 41.25 mm.

Effect of Artificial Saliva Modification on Pitting Corrosion and Mechanical Properties of the Remanium®-Type Orthodontic Archwire

“…This is evidenced by the Young's modulus equal to 134.24 GPa. This value is similar to Young's modulus for titanium and titanium alloys (E ≈ 105 GPa) [35]. The average deformation for R m is 2.70% for the archwire at the initial state.…”

Cortico-cancellous osseointegration into additively manufactured titanium implants using a load-bearing femoral ovine model

“…The elastic modulus of human cancellous and cortical bone typically varies from 0.01 to 3 GPa and from 3.3 to 21.8 GPa, respectively ( Morgan et al, 2018 ). This stands in contrast to the elastic modulus in the region of 110 GPa for titanium aluminum vanadium alloy (Ti-6Al-4V) ( He et al, 2020 ). A significant discrepancy between implant and tissue stiffness can result in stress shielding due to decreased physiological loading of the bone surrounding an implant ( Niinomi and Nakai, 2011 ).…”

“…for titanium aluminum vanadium alloy (Ti-6Al-4V) (He et al, 2020). A significant discrepancy between implant and tissue stiffness can result in stress shielding due to decreased physiological loading of the bone surrounding an implant (Niinomi and Nakai, 2011).…”

Effect of Direct Powder Forging Process on the Mechanical Properties and Microstructural of Ti-6Al-4V ELI

“…Therefore, the total deformation needed to produce a fully dense bar of Ti-6Al-4V DPF combined with the annealing in the upper α+β region caused the breakup of the lamella into smaller sections and their thickening. For the latter, the holding at high temperature and the slow cooling from α+β annealing results in the increase in the size of α lamella as well as the β grain [ 17 , 21 ]. Additionally, no defect or residual porosity was observed by the optical analysis.…”