A low-density high-entropy dual-phase alloy with hierarchical structure and exceptional specific yield strength

A high-entropy dual-phase AlTiVCoNi alloy with a low density of ∼6.24 g cm−3 is developed, and it consists hierarchical structure, including an ordered L21 phase, disordered body-centered-cubic (BCC) solid-solution nano-sized precipitates embedded in the BCC phase. It found that this new shows phase stability after heat treatment at 1200°C for 24 h, compressive yield strength annealed approximately equal to as-cast condition, ∼1.6 GPa. This displays exceptional room temperature 600°C, specific strengths ∼261 ∼210 MPa g−1 cm3, respectively. The semi-coherent interface phases makes stable regulates work-hardening mechanism. Local dynamic-recrystallization behavior grain evolution are observed as-prepared during compression 800 1000°C, which results high-temperature softening. muti-phase structure would provide paradigm development next-generation low-density, structural materials applications.