Abstract
Currently, the aluminum alloys are utilized more in level of all industries for different applications; furthermore, industries need high‐strength alloys for making innovative components. For those reasons, many researchers hope to prepare hybrid aluminum metal matrix composites at various composition levels. In this experimental work, we intended to prepare the hybrid metal matrix composites such as aluminum alloy 7079 with reinforcement of ZrO2 + Si3N4 through stir‐casting process. Major findings of this work, as to optimize the stir‐casting process, can be to continually conduct wear test and evaluate the microhardness of the stir‐casted specimens. Optimization of stir‐casting process parameters is a preliminary work for this research by Taguchi tool. The chosen parameters are % of reinforcement (0%, 4%, 8%, and 12%), agitation speed (450 rpm, 500 rpm, 550 rpm, and 600 rpm), agitation time (15 min, 20 min. 25 min, and 30 min), and molten temperature (700°C, 750°C, 800°C, and 850°C). The prepared stir‐casted materials are tested by wear analysis and microhardness analysis, through Pin‐on‐Disc wear tester and Vickers hardness tester, respectively. Wear parameters are optimized, the minimum wear rate is evaluated, and also the wear worn‐out surfaces are examined through SEM analysis.
Highlights
Aluminum alloys provide excellent mechanical properties for all types fabrication process, as well as machinability characteristics; further, its strength can be increased by adding reinforcement particles
The % of reinforcement was the extremely influenced parameter for effects in the wear test followed by sliding distance, applied load, and disc speed. e optimal parameter of the wear test was recorded as 12% of reinforcement, 25 N of applied load, 1.5 m/s of disc speed, and 1000 m of sliding speed
Aluminum alloy 7079 with the addition of zirconium oxide and silicon nitride (AMCs) hybrid composites was prepared through stir-casting process
Summary
Aluminum alloys provide excellent mechanical properties for all types fabrication process, as well as machinability characteristics; further, its strength can be increased by adding reinforcement particles. Addition of hard ceramic particles offers good strength of the alloy materials and enhances the mechanical properties. Wang et al [1] investigated the tribological and mechanical strength of the magnesium matrix composites; they prepared the AZ91 magnesium ally with accumulation of graphite particles. Graphite is added at 5%, 10% of volume fraction levels to the magnesium alloy, and compared to both levels of volume fraction, the 10% reduces the wear rate. 10% of graphite can decrease the mechanical strength such as yield strength, tensile strength, and elongation. In the base alloy using 5% of graphite, it can be refined well in condition and form a uniform mixture
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