Eventos Anais de eventos
COBEF 2023
12th Brazilian Congress on Manufacturing Engineering
The Experimental Approach on the Tribological Behavior of Al-12wt%Si and Al-20wt%Sn Alloys submitted to Ball-on-Flat Microabrasive Wear Test Under Dry Sliding Conditions.
Submission Author:
Kleber Sabat da Cruz , PA
Co-Authors:
Kleber Sabat da Cruz
Presenter: Kleber Sabat da Cruz
doi://10.26678/ABCM.COBEF2023.COF23-0249
Abstract
The wear behavior of light alloys can be evaluated by parameters such as wear volume (V) or wear rate (Q). According to previous studies, the wear rate is dependent of the applied load during the test used to analyze the wear resistance. In other research, experimental laws correlating dendrite arm spacings and wear volume were obtained for Al-Sn, Al-Bi, Al-Sn-Si alloys similar to the Hall-Petch relation for mechanical properties. This study seeks the experimental analysis with the objective to research the relationship between wear rate (Q) and the test time ( t ) during the ball-on-flat microabrasive wear test, for samples made of pure aluminum, pure tin and the alloys Al-12wt%Si and Al-20wt%Sn. These materials were chosen due to their wide tribological applications, particularly as bearing materials. The tests were performed for five different test times (2, 5, 15, 20 and 40 min) under dry sliding conditions, with a hard spherical ball made of bearing steel (AISI 52100) used as a counter-body. The experimental data were processed by the linear regression, and the experimental laws to describe the evolution of the wear rate (Q) as a function of the test time (t) were obtained by the polynomial regression analysis with least squares method to verify the quality of fitting (R-squared). The results presented that the alloys were more wear resistant than the pure elements (Sn and Al), and the characterization of the wear crater produced in the wear test were performed by optical microscopy. The diameter of each crater was measured five times and the average value and standard deviation were calculated to obtain accuracy. The wear rate (Q) was calculated by the equation based on the geometry of the crater, and tended to increase with the test time, which agrees with Archard’s law because the test time is proportional to the sliding distance, and the wear rate is proportional to the wear volume. The worn surface was characterized by electron microscopy to analyze the wear mechanism that acted during the test.
Keywords
Tribology, Wear, light alloys, aluminum, Aluminum alloys
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