Abstract
This paper investigated the influences of Pr addition and heat treatment (T6) on the dry sliding wear behavior of AZ91 alloy. The wear rates and friction coefficients were measured by using a pin-on-disc tribometer under loads of 30, 60 and 90 N at dry sliding speeds of 100 rpm, over a sliding time of 15 min. The worn surfaces were examined using a scanning electron microscope and was analyzed with an energy dispersive spectrometer. The experimental results revealed that AZ91-1.0%Pr magnesium alloy exhibited lower wear rate and friction coefficient than the other investigated alloys. As the applied load increased, the wear rate and friction coefficient increased. Compared with the as-cast AZ91-1.0%Pr magnesium alloy, the hardness and wear resistance of the alloy after solution treatment were reduced, and through the subsequent aging, the hardness and wear resistance of the alloy were improved and the hardness was 101.1 HB (compared to as-cast AZ91 magnesium alloy, it increased by 45%). The AZ91-1.0%Pr with T6 magnesium alloy exhibited best wear resistance. Abrasion was dominant at load of 30 N, delamination was dominant at load of 60 N and plastic deformation was dominant at load of 90 N. Oxidation was observed at all loads.
Highlights
AZ91 magnesium alloy is excellent and the most widely used of die-casting magnesium alloys, due to its high strength-to-weight ratio, suitable corrosion resistance and mechanical properties for room temperature application [1,2,3]
The results show that the aging treatment and SiCp particles were effective in improving the mechanical properties of AZ91 magnesium alloy
Based on the above reasons, this paper studied the effect of Pr addition and T6 heat treatment on the microstructure and wear properties of AZ91 alloy under different loads
Summary
AZ91 magnesium alloy is excellent and the most widely used of die-casting magnesium alloys, due to its high strength-to-weight ratio, suitable corrosion resistance and mechanical properties for room temperature application [1,2,3]. Modifying the morphology of the microstructure or generating new reinforcing phases can improve the wear resistance of the alloy. The results showed that lanthanum-base rare earth element additions were not improving the wear rate of the alloys at the wear temperature of 25 ◦ C. The results show that the aging treatment and SiCp particles were effective in improving the mechanical properties of AZ91 magnesium alloy. Addition of rare earth can reduce the number of softer and lower melting β-Mg17 Al12 phase, and change the morphology of β-Mg17 Al12 phase It can generate new rare earth reinforced phases, and improve the wear resistance of the matrix alloy. Based on the above reasons, this paper studied the effect of Pr addition and T6 heat treatment on the microstructure and wear properties of AZ91 alloy under different loads
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