Abstract
The Ti–5.5Si alloy composites reinforced by La2O3 particles were prepared through the synthesis reaction from Ti, Si, La and SiO2 with non-consumable vacuum arc melting. The microstructures were examined by means of optical microscopy (OM), backscattered scanning electron microscopy (SEM). The phase analysis was identified by X-ray diffraction (XRD). There are four phases in the composite, namely Ti5Si3, La2O3, α-Ti and β-Ti. In the microstructures of those composites, the continuous and quasi-continuous network-shape Ti5Si3+Ti eutectic cell abundantly exists, and the La2O3 reinforcement grows from near-equiaxed shape to dendritic shape with increase of La content. The compressive properties of the as-cast composites were tested with strain rate 1mm/min at room temperature. The results showed that the introduction of in situ La2O3 particles can significantly improve the compressive strength and the Young's modulus of Ti–5.5Si alloy.
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