Preparation and properties of Ti-Zr-Ta alloy assisted by hydrogenation

Abstract

Ti-Zr-Ta refractory alloy has excellent mechanical properties and impact-initiated energy release characteristics, and shows good application prospects in the field of energetic structural materials. At present, Ti-Zr-Ta alloy is mainly prepared by melting process. However, its components are all refractory metals, so it is difficult to fabricate large parts with uniform structure by melting and casting. Based on this, the Ti-Zr-Ta refractory alloy powder was prepared by hydrogenation-dehydrogenation, and then sintered by vacuum hot-pressing process. On this basis, the microstructure, mechanical properties and shock-induced energy release characteristics of the sintered Ti-Zr-Ta alloy were studied. The results show that the average particle size of Ti-Zr-Ta alloy powder prepared by hydrogenation-dehydrogenation is 9.4 μm, and it is composed of three phases of BCC1, BCC2 and HCP. The density of Ti-Zr-Ta alloy sintered at 1300 ℃ is 7.34 g/cm3, which roughly achieves full densification, and the alloy is mainly composed of two phases of BCC1 and BCC2. The quasi-static compressive strength and fracture deformation are 1637 MPa and 6.4%, respectively, showing brittle fracture characteristics. In the ballistic gun experiment, the peak overpressure generated by 5.6 g of as-sintered Ti-Zr-Ta alloy breaking through the target plate at a speed of 1493 m/s in the 27 L closed target box reaches 0.195 MPa, showing excellent impact energy release characteristics, and the energy release is mainly derived from the oxidation reaction of small fragments generated by high-speed impact of alloy projectiles.

Keywords

• energetic structural material
• ti-zr-ta alloy
• hydrogenation-dehydrogenation method
• sintering temperature
• impact-initiated energy release characteristic