Abstract
In the present study, the wear behaviour of two aluminium alloys (AA-5754 and AA-5083) is analysed where these have been previously processed by severe plastic deformation (SPD) with equal channel angular pressing (ECAP). In order to achieve the objectives of this study, several disks made of these alloys are manufactured by isothermal forging from different initial states. The microstructures of the initial materials analysed in this study have different accumulated deformation levels. In order to compare the properties of the nanostructured materials with those which have not been ECAP-processed, several disks with a height of 6 mm and a diameter of 35 mm are manufactured from both aluminium alloys (that is, AA-5754 and AA-5083) isothermally forged at temperatures of 150 and 200 °C, respectively. These thus-manufactured disks are tested under a load of 0.6 kN, which is equivalent to a stress mean value of 18 MPa, and at a rotational speed of 200 rpm. In order to determine the wear values, the disks are weighed at the beginning, at 10,000 revolutions, at 50,000 revolutions and at 100,000 revolutions, and then the volume-loss values are calculated. This study was carried out using specific equipment, which may be considered to have a block-on-ring configuration, developed for testing in-service wear behaviour of mechanical components. From this, the wear coefficients for the two materials at different initial states are obtained. In addition, a comparison is made between the behaviour of the previously ECAP-processed aluminium alloys and those that are non-ECAP-processed. A methodology is proposed to determine wear coefficients for the aluminium alloys under consideration, which may be used to predict the wear behaviour. It is demonstrated that AA-5754 and AA-5083 aluminium alloys improve wear behaviour after the ECAP process compared to that obtained in non-ECAP-processed materials.
Highlights
A great deal of attention has been paid over the past several years to the severe plastic deformation (SPD) processes of metallic materials, where the so-called equal channel angular pressing (ECAP)stands out [1]
In order to make a comparison between ECAP-processed and non-ECAP-processed aluminium alloys, several disks made of these alloys are manufactured by isothermal forging from distinct initial states
ECAP-processed material and from non-ECAP-processed material, conventional forging at 380 ◦ C and annealed material
Summary
A great deal of attention has been paid over the past several years to the severe plastic deformation (SPD) processes of metallic materials, where the so-called equal channel angular pressing (ECAP). These authors found that the friction coefficient is decreased after four ECAP passages, with route Bc at low temperature Another remarkable piece of research is that by El Aal and Kim [13], where these authors analysed the wear properties of HPT-processed Al-7%Si alloy through ball-on-flat surface reciprocating sliding wear tests. Another interesting study on the influence of high temperature on wear behaviour is the one carried out by Kumar et al [30] in which these researchers analysed the effect of fly ash particulate on high temperature dry sliding wear resistance of AA-6061 This composite metallic material is developed by powder metallurgy and hot extrusion and it is subjected to pin-on-disc tests at room temperature, 100, 200 and 300 ◦ C. One of the main conclusions is that the addition of fly ash to AA-6061 increases the temperature of mild-to-severe wear transition up to 300 ◦ C
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