An investigation of the effect of high-energy milling time of Ti6Al4V biomaterial on the wear performance in the simulated body fluid environment

Abstract

In this study, the effect of milling time on wear behaviour of the Ti6Al4V alloy produced with the high-energy milling method was investigated. The Ti6Al4V alloy was milled at five different milling times in a mechanical alloying device. The milled powders were cold-pressed under 620 MPa pressure, sintered at 1300°C for 2 h and cooled to room temperature in the furnace. The sintered alloys were characterised with SEM, XRD and hardness and density measurements. Wear tests were performed using a pin-on-disc type wear testing device, under three different loads, at four different sliding distances in simulated body fluid environment. Results showed a decreasing powder size with increasing milling time. The highest decline in size occurred for the powders milled for 120 min. The result of hardness measurements and wear tests showed that samples milled for 120 min had both the highest hardness value and the lowest weight loss.

Investigation of the electrochemical corrosion properties of high-energy milled Ti6Al4V alloy in simulated body fluid environment

“…As the high-energy milling time increases, V-rich regions (zone shown with 2) in the matrix are observed to decrease (due to the decrease in the average particle size of the powder). This is because decreasing vanadium shows a more homogeneous distribution during the high-energy milling process [15]. Figure 2 shows the XRD results of Ti6Al4V alloys high-energy milled for 15 and 120 min.…”

“…A planetary-type mill was used in high-energy milling operations of elemental powders prepared. The powders prepared in the desired chemical composition were high-energy milled in stainless steel milling chamber using five different milling times (15,30,60, 90 and 120 min). One percent ethanol as process control chemical, stainless steel balls 8 mm in diameter, 20:1 ball/powder ratio and 50% chamber fill rate were used to prevent agglomeration during these operations.…”

“…SBF was used as a solution during corrosion tests. The chemical composition of the SBF used in the study is shown in Table 1 [15]. The solution temperature was kept constant at 37 ± 0.2°C using a hot-plate placed under the test cell.…”

The Effect of Milling Time on Microstructure and Wear Behaviours of AISI 304 Stainless Steel Produced by Powder Metallurgy

“…It can be observed that the size of the pores in the microstructure decreased with increasing MA time. A former study reports that the MA time is an effective process parameter for the powder size of the alloy in the MA process [8]. The decrease in the size of powder grains leads to a decrease in the pore size.…”

Tribological Performance and Electrochemical Behavior of Ti‐29Nb‐14Ta‐4.5Zr Alloy in Simulated Physiological Solution

“…The heat-treated specimens were firstly immersed in the solution for 60 min until the open circuit potential (OCP) reached its level. Polarization measurements were performed in a conventional corrosion cell in the SBF (Table 2 [32] ; pH %7.40). Electrochemical impedance spectroscopy (EIS) was conducted in the frequency range of 10 mHz to 100 kHz with a 5 mV amplitude of the alternating current (AC) signal.…”