Abstract
Fe 3Al matrix composites reinforced with 0–13 vol.% fine alumina particles were fabricated by hot pressing powder mixtures of iron and aluminium. The microstructure and mechanical and several other properties of the alumina-reinforced composites were examined. As a result of the dispersion of alumina powder, the grain size of the matrix decreased. No third phase was observed between the matrix and the alumina by transmission electron microscopy. The matrix alloy showed quite good tensile strength (above 800 MPa) as well as good elongation (up to 5%) at room temperature. On increasing the volume fraction of alumina, the tensile strength increased slightly. The 0.2% proof stress was improved considerably more than the tensile strength and reached its maximum value at an alumina volume fraction of 2.5%. At 500 °C the strength of the composite was higher by 100 MPa than that of the monolithic alloy. The oxidation resistance of the Fe 3Al and its composites up to 1000°C proved to be quite good.
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