Abstract
Aluminum base alloys containing chromium (Cr) and zinc (Zn) were produced using extrusion and powder metallurgy techniques. Cr additions ranged between 5 to 10 wt. %, while Zn was added in an amount between 0 and 20 wt. %. Heat treatment processes were performed during powder metallurgy process, at different temperatures, followed by water quenching. Similar alloys were extruded with an extrusion ratio of 4.6 to get proper densification. Optical microscopy was used for microstructure investigations of the alloys investigated. The element distribution microstructure study was carried out using the Energy Dispersive X-ray analysis method. Hardness and tensile properties of the investigated alloys have been examined. Wear resistance tests were carried out and the results were compared with these of the Al-based bulk alloys. Results showed that the aluminum base alloys, containing 10 wt. % Cr and heat treated at 500 °C for one hour followed by water quenching, exhibited the highest wear resistance and better mechanical properties.
Highlights
Aluminum chrome matrix composites (ACMC) are used in a wide range of industries including transportation, electronics, leisure, and others [1,2,3,4]
ACMC are usually produced by mechanical alloying of different kinds of metal powders using compression, at a temperature near room temperature, which results in nanocrystalline and supersaturated alloy powders at low temperatures [3]
The results showed that the decrease of the quenching rate from 960 ◦ C/s to 2 ◦ C/s revealed a decrease in the hardness after aging, for the homogenized and solution heat treated alloy with large equiaxed grains
Summary
Aluminum chrome matrix composites (ACMC) are used in a wide range of industries including transportation, electronics, leisure, and others [1,2,3,4]. Kurtuldu et al have investigated the effect of trace addition on the aging behavior of aluminum alloys containing Cr; the effect of Cr addition on Zn diffusions in molten of Al-Zn-Cr alloys [8,9] It has been a subject of interest that minor and trace additives have a noticeable effect on these alloys, as far as structure and tensile properties are concerned [10]. In order to reduce the grain coarsening resulting from the heat treatment process, similar cold compacted and heat treated alloys were subjected to an extrusion process followed by solution heat treatment and quenching in room temperature water. The influence of adding Zn and various percentages of Cr to aluminum alloys on the density, tensile behavior, hardness, corrosion, and wear resistance of the Al-based alloys was examined; in addition, the effect of production methods on those properties was inspected
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