Abstract
• The phase stability of a new low-weight AlNb 2 TiV RHEA was firstly investigated. • A15-Nb 3 Al and σ -Nb 2 Al precipitates formed from B2 matrix when annealing at 1100 °C. • Rod-like Nb 3 Al phase original from GBs grow along parallel orientation. AlNb 2 TiV, a newly proposed low-weight refractory high-entropy alloy (LW-RHEA), shows good mechanical properties at high temperatures. However, the thermodynamic phase stability is still not clear. Here, we evaluated the phase stability of AlNb 2 TiV at the temperature of 700–1100 °C. The LW-RHEA is decomposed into B2, A15-Nb 3 Al and σ -Nb 2 Al phases after annealing at 1100 °C. Rod-like A15-Nb 3 Al precipitates from GBs grow along parallel orientation. Chain-like σ -Nb 2 Al particles precipitate along GBs.
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