Microstructure and Mechanical Behaviors of Electron-Beam Melted Ta10W Alloy at High Temperatures

Ta10W refractory alloy was recently fabricated utilizing powder-bed electron beam melting technology. To investigate the mechanical behaviors of this alloy under a harsh environment, a tensile test and a split-Hopkinson pressure bar experiment were employed. It has been suggested that the ultimate tensile strength (UTS) of Ta10W alloy under air is sharply reduced at 600 and 800 °C compared to that at room temperature and keeps dropping at 1000 °C under argon protection. The detailed UTS values of Ta10W alloy under 600, 800, and 1000 °C are 467, 232, and 111 MPa, respectively. The peak values of the strength of the Ta10W refractory alloy at 300, 600, and 1000 °C in the split-Hopkinson pressure bar experiment are 694, 633, and 400 MPa, with quite high phase stability, respectively. The obtained results provide significant data for the application of the additively manufactured Ta10W refractory alloy in harsh environments.