Abstract
This paper investigated the influence of heat treatment (T6) on the dry sliding wear behavior of SiCp/Al-5Si-1Cu-0.5Mg composite that was fabricated by electromagnetic stirring method. The wear rates and friction coefficients were measured using a pin-on-disc tribometer under loads of 15–90 N at dry sliding speeds of 100 r/min, 200 r/min, and 300 r/min, over a sliding time of 15 min. The worn surfaces and debris were examined using a scanning electron microscope and was analyzed with an energy dispersive spectrometer. The experimental results revealed that SiCp/Al-5Si-1Cu-0.5Mg alloy treated with T6 exhibited lower wear rate and friction coefficient than the other investigated alloys. As the applied load increased, the wear rate and friction coefficient increased. While, the wear rate and friction coefficient decreased with the sliding speed increasing. The morphology of the eutectic silicon was spheroidal after the T6 heat treatment. SiCp particles and Al2Cu phase can be considered as the main raisons for improving the wear behavior. Abrasion and oxidation were the wear mechanisms at low load levels. However, the wear mechanisms at high load levels were plastic deformation and delamination.
Highlights
In recent years, Al-Si alloys have been widely used in the manufacture of vehicles, due to their excellent physical properties, including low desity, high strength-to-weight ratio, good fluidity, low coefficient of thermal expansion and good machinability [1]
Few literatures can be found to reveal the effect of T6 heat treatment on the wear properties of Al-Si alloys that are reinforced with SiCp processed by electromagnetic stirring method
A pin‐on‐disc dry sliding wear test of three alloys processed by the electromagnetic stirring
Summary
Al-Si alloys have been widely used in the manufacture of vehicles, due to their excellent physical properties, including low desity, high strength-to-weight ratio, good fluidity, low coefficient of thermal expansion and good machinability [1]. Under the conditions of the traditional casting process, Al-Si alloys usually contain massive coarse, long-needle or lamellar shape eutectic Si phases Those defects often lead to poor mechanical properties and wear resistance. Dwivedi found that SiCp were evenly distributed in the matrix due to the melt flow that is induced by the rotating magnetic field of electromagnetic stirring This indicates the effectiveness of the technique electromagnetic stir casting process that is utilized for the production. Few literatures can be found to reveal the effect of T6 heat treatment on the wear properties of Al-Si alloys that are reinforced with SiCp processed by electromagnetic stirring method. A pin-on-disc test was carried on to investigate the heat treatment on the wear properties of SiCp/Al-5Si-1Cu-0.5Mg composite processed by electromagnetic stirring method. The wear mechanisms of the tests were analyzed by scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS)
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