Production of oxide dispersion strenghtened aluminium matrix nano composites for elevated temperature applications

In this study, it was aimed to increase elevated temperature strength of commercially pure aluminium. In this purpose, 0.5wt.%, 1wt.% and 2wt.% nano-Y2O3 dispersions were added to molten aluminium by stir casting method. Elevated temperature tensile behaviour of produced alloys was investigated from room temperature up to 250 °C. Tensile test observations revealed that the yield strength of all Y2O3/Al alloys increased with increasing temperature. The highest value of yield strength at 125°C and 250°C was observed with 0.5wt.% Y2O3 reinforcement. While the ultimate tensile strength of alloys at room temperature was lower than the pure aluminium, it was observed that the ultimate strength of all Y2O3/Al alloys at 250°C was slightly higher than pure aluminium. KEYWORDS: Aluminium, Y2O3, stir casting, elevated temperature tensile test