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Ta-Based Alloy Shows 100 MPa Yield Strength at 2,400 °C and Over 800 MPa at Room Temperature
@Nature reported development of a boron-stabilized HfO₂-strengthened Ta-based alloy. It delivers ultrahigh-temperature tensile strength alongside room-temperature ductility exceeding prior refractory alloys.
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A boron-stabilized HfO₂-strengthened Ta-based alloy produced through a boron-intervened in situ oxidation reaction achieves a tensile yield strength of around 200 MPa at 2,000 °C and 100 MPa at 2,400 °C, @Nature reported. Oxide particles approximately 50 nm in diameter are dispersed densely and uniformly in the grain interior.
At room temperature the alloy records an ultimate tensile strength greater than 800 MPa and an elongation-to-failure of about 35 percent.
Boron segregation around the oxide nanoparticles supplies thermal stability against coarsening between 2,000 °C and 2,400 °C. The paper states that extreme applications require materials strong above 2,000 °C and highly formable at room temperature. Brittle ceramics and intermetallic compounds are excluded because they lack room-temperature ductility.
The combination of ultrahigh-temperature strength and room-temperature ductility surpasses all previous refractory alloys, including multi-principal-element alloys, the paper said. The strategy extends beyond traditional oxide-dispersion strengthening to enable load-bearing use at extreme temperatures.
