Effect of Refractory Oxide (CaO) on the Structure and Mechanical Properties of Al-4%Cu Alloy
Keywords:
Refractory Oxide, Structure, Mechanical Properties and Al-4%Cu AlloyAbstract
Aluminium-4%wt copper alloy being a 2xxx series alloy, exhibits moderate strength as a result of needle-like structure of the intermetallic compound (Al2Cu(θ)) formed as non-coherent precipitates as the alloy cools slowly to ambient temperature. Hence, this paper focuses on addition of a refractory oxide (CaO) to melted Al-4%wtCu alloy, in order to refine the grain size and structure, thereby improving the mechanical properties of the alloy. The objective of this work is to study the extent to which each concentration of CaO influenced the mechanical properties of Al-4%Cu alloy and the concentrations that gave an appreciable mechanical property suitable for engineering application. The experiment was carried out with refractory oxide (CaO) with concentration of 0.75%, 1%, 1.25%, 1.5%, 1.75%, 2% and 2.25% by weight to melted Al-4%Cu alloy, stirred and sand cast. The results established that the refractory oxide (CaO) can be used to improve the microstructure and mechanical properties of Al-4%Cu alloy.
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