Abstract
• Lightweight refractory high-entropy alloy was synthesized by mechanical alloying. • The milled powder exhibited a homogeneity chemical distribution. • The average grain size of milled powder is less than ∼8 nm. • The milled powder maintained BCC phase and nanosized grains at 1200 °C. The lightweight TiAlV 0.5 CrMo refractory high-entropy alloy with nanocrystalline structure has been fabricated by mechanical alloying. Microstructure, morphology and thermal stability of the powder under various milling time and annealing temperatures were investigated. The 30 h milled powder consists of a single body-centered cubic (BCC) solid solution structure with an average grain size of less than ∼8 nm. The single solid solution structure transformed into BCC and Laves phases after annealing at 1000 °C, mainly due to the phase transformation of the metastable supersaturated solid solution. It is noticeably interested that the mechanically alloyed powder exhibited excellent thermal stability when annealed at 600, 800 and 1200 °C.
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