Microstructural evolution and thermal stability in a nanocrystalline lightweight TiAlV0.5CrMo refractory high-entropy alloy synthesized by mechanical alloying

Authors：Gao, Fei; Sun, Yu^*; Hu, Lianxi^*; Shen, Jingyuan; Liu, Wenchao; Ba, Meiyi; Deng, Cheng

Source：Materials Letters, 2022, 329: 133179.

DOI：10.1016/j.matlet.2022.133179

• Refractory high-entropy alloy
• Lightweight
• Nanoparticles
• Powder technology
• Thermal properties

The lightweight TiAlV0.5CrMo 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 similar to 8 nm. The single solid solution structure transformed into BCC and Laves phases after annealing at 1000 degrees C, mainly due to the phase trans-formation 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 degrees C.

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