Abstract
The rapid in situ formation of a Ti alloy/TiC porous composite was achieved using the powder metallurgy approach. Ti6Al4V powders were mixed with 14.5vol.% of multiwalled carbon nanotubes (MWCNTs) and the particle size of Ti6Al4V was reduced to ∼5μm by ball milling. The MWCNTs acted as microwave susceptors as well as reactants for the rapid sintering of Ti alloys. The green compact of the Ti6Al4V/MWCNTs powder was sintered in a 1.4kW, 2.45GHz bi-directional microwave emission furnace without using any protective gas environment. The microwave sintering was completed within 2min. The surface temperature of the sample reached 1620°C during sintering, as measured by a pyrometer. Titanium carbide was formed after the sintering as confirmed by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The composite has a porosity of approximately 25%, compressive strength of 270.41±24.97MPa, compressive yield stress of 145.48±27.28MPa, compressive Young’s modulus of 10.87±2.46GPa and compressive strain of 3.75±1.11%. The Vickers hardness value in the TiC region (545.4±13.9HV) is significant higher than that in the Ti alloy region (435.9±12.9HV). An overall Rockwell hardness of 47HRA was measured.
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