Metal matrix composites based on Ti-6242 synthesized by Spark Plasma Sintering

A composite consisting of Ti-6Al-2Sn-4Zr-2Mo as matrix and Ti-42.3Al-3.8Nb-1Mo-0.1B (at%; known as γ-TiAl-TNM) as reinforcement was developed to increase the working temperature for titanium based alloys. The volume fraction (10 wt%, 15 wt%) and the particle size (< 20 µm, 20-45 µm) of the TiAl-TNM, and the sintering temperature (1100 °C, 1150 °C) were varied. It was shown, that the working temperature of Ti-6Al-2Sn-4Zr-2Mo can be increased to 650 °C by the addition of 10 wt% TiAl-TNM due to an elongation > 2% at room temperature and an increase in yield strength of 100 MPa in the temperature range of room temperature to 650 °C compared to Ti-6Al-2Sn-4Zr-2Mo. Furthermore, the dissolving of TiAl-TNM, which takes place already at 650 °C, does not lead to a decline in yield strength and tensile strength.