As environmental concerns and the law of energy resources become more prevalent around the world, almost all sectors must take action to address these two critical challenges. The production/manufacturing sector also takes precautions regarding these two important issues both in the product life cycles it produces and in the products they supply. Primary ingots, which are used as raw materials in the aluminum casting industry, have significantly higher energy consumption and CO2 emissions than secondary ingots. Thus, secondary aluminum should be used more frequently.
The mechanical properties of secondary aluminum recycling are significantly impacted by impurities, oxides, and boron oils in the structure. The mechanical properties of a material can be dramatically reduced by the presence of oxides and hydrogens. For these decreases not to fall under certain limits, secondary aluminum can be used in certain proportions. Another way to increase mechanical properties above certain limits is heat treatment applications.
In this study, sample casting was carried out by melting secondary aluminums to preserve the high energy used during the production of primary aluminum, which is recycled due to environmental concerns. To increase the possible low mechanical properties of these casted samples, heat treatment was applied. As the heat treatment process, T6 Heat treatment, which is frequently applied in A356 aluminum alloys, was applied. As a result of the study, the change in the mechanical properties of the samples cast from secondary aluminum after the applied heat treatment was investigated.
In conclusion, effect of the heat treatment on metallurgical properties was investigated by an optical microscope. Mechanical properties were obtained by tensile tests. From these tests, elongation, ultimate tensile strength, and yield strength values obtained and comparing with each condition. According to the results, the correlation between elongation, ultimate tensile strength and yield strength under heat treatment conditions are established.
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