Wear Behavior of Aluminum Alloys at Slow Sliding Speeds

Abstract

The investigated slow sliding speeds presented in this work enable the understanding of the wear behaviour on aluminium alloys and could possibly facilitate the completion of the previously proposed wear mechanism map for aluminium at this slow sliding speed range. Dry sliding block-on-ring wear tests were carried out on aluminium alloys, AA5754 (Al-Mg), AA6082 (AlMg-Si) and AA7075 (Al-Zn-Cu), at a very slow sliding speed range (< 0.01 m/s). A bearing steel ring of AISI 52100 was used as counterbody. Tests were performed at varying contact pressures, 20, 100 and 140 MPa, and sliding speeds ranging from 0.001 to 1.5 m/s. The wear tracks and debris collected were examined by scanning electron microscopy (SEM), energydispersive spectroscopy (EDS), and X-ray diffraction (XRD), with the aim of analysing their morphology and composition. At relatively slow sliding speeds (> 0.01 m/s), the specimens exhibited a wear process placed at the mild wear regime, characterized by oxidation and delamination mechanisms of both the aluminium specimen and the steel ring. However, at very slow speed range (< 0.01 m/s), an increase of the wear rate and the friction coefficient isobserved for all the aluminium alloys thus suggesting that an alternative wear mechanism could be taking place.

Anodizing of AA6082-T5 by conventional and innovative treatments: Microstructural characterization and dry sliding behaviour

“…Representative coefficient friction (COF) values recorded as a function of sliding distance under a normal load of 5 N are shown in Figure 6 for both the untreated AA6082 alloy and the anodised surfaces. In the steady-state regime, untreated AA6082 slides against 100Cr6 steel with a COF of about 0.4, lower than for treated samples and consistent with literature data [25][26][27][28]. Moreover, dynamic COF data of the AA6082/steel couple displayed large oscillations, due to stick-slip phenomena [29].…”

Oleate-Based Protic Ionic Liquids As Lubricants for Aluminum 1100

“…The obtained tracks were dark, perhaps related to oxide formation. 41,42 Observing the corresponding ball morphology, both for dry condition (Figure 7a) and with the use of the commercial lubricant (Figure 7e) there was material transfer with the sliding direction designed. The material transfer suggested the development of adhesion 43,44 between the bodies and with the displacement of the ball, the material removal from the plate took place and formed the third body (debris).…”

Fabrication characteristics and tribological behavior of Al/SiC/Gr hybrid aluminum matrix composites: A review

“…However, one of the major drawbacks of these materials is their low wear resistance. This limitation is due to the fact that Al alloys undergo extensive plastic deformation and material removal under sliding wear conditions [3][4][5][6][7]. Furthermore, protective layers are not formed on the wear surface of these alloys under severe conditions, and direct metal-to-metal contact occurs between the sliding surfaces.…”