This study reports the structure and mechanical properties of a new refractory Ti₄₀Nb₃₀Hf₁₅Al₁₅ (at.%) high entropy alloy. The alloy was fabricated by vacuum arc melting and had a density of 7.07 ± 0.03 g/cm³. After annealing at 1200 °C for 24 h, the alloy possessed a single-phase B2 structure. Further annealing at 600 °C for 24 h resulted in the formation of Widmanstatten (Ti, Al)-rich orthorhombic particles (O-phase) in a bcc matrix. The single-phase B2 alloy demonstrated high (>50%) compressive ductility and a pronounced work hardening capacity. The precipitation of the O-phase particles led to a 50% strength increment at 22 and 600 °C, with some sacrificing in the compressive ductility at 22 °C. The obtained results suggest new approaches to the development of precipitation-strengthened refractory high entropy alloys with a balanced combination of the room- and high-temperature properties.

这项研究报告了一种新型的难熔Ti ₄₀ Nb ₃₀ Hf ₁₅ Al ₁₅（at。％）高熵合金的结构和力学性能。该合金是通过真空电弧熔化制造的，密度为7.07±0.03 g / cm ³。在1200℃下退火24小时后，该合金具有单相B2结构。在600°C下进一步退火24 h，导致在密件抄送基质中形成了富含Widmanstatten（Ti，Al）的正交晶颗粒（O相）。单相B2合金表现出高（> 50％）的压缩延展性和明显的加工硬化能力。O相颗粒的沉淀导致在22和600°C时强度增加50％，同时牺牲了22°C时的压缩延展性。获得的结果表明，开发出一种兼顾室温和高温性能的沉淀增强耐火高熵合金的新方法。