Akademik Veri Yönetim Sistemi
Materials Today Communications, cilt.40, 2024 (SCI-Expanded)
The effect of aging temperature on the lubricated wear behavior of multi directionally forged Al-40Zn-3Cu alloy was systematically investigated at different loads and sliding speeds. Microstructural and worn surface examinations of the alloy samples were performed by scanning electron microscopy, scanning transmission electron microscopy and energy dispersive spectrometry while their tribological properties were investigated with a ball on disc type wear test apparatus. The results showed that aging treatment at different temperatures after multi-directional forging changed the morphology of Zn-rich nanoscale η precipitates and Cu-rich θ particles and their dispersion in α-Al matrix. Their changes brought about an increase in hardness, strength, and wear resistance of Al-40Zn-3Cu alloy but a decrease in its ductility. It was also observed that the aging temperature, load and sliding speed had a combined effect on their wear response. As the applied load and sliding speed increased, friction coefficient of the samples decreased while their mass loss increased continuously with load but decreased with sliding speed after showing an increase. The adhesion, abrasion and oxidation were observed to be operative wear mechanisms for the alloy. The wear results of the alloy samples were discussed in terms of their microstructures and mechanical properties, and oil lubrication. The aging treatment at 150 °C after multi-directional forging increased the wear resistance of Al-40Zn-3Cu alloy more than 50 percent by providing a moderate hardness (129 HB), yield strength (310.9 MPa), tensile strength (383.2 MPa), and ductility (9.9 %).