Abstract
MoNbRe0.5TaW high-entropy alloy with different raw material forms was synthesized using arc-melting technique. The alloy melted with bulks or powders shows different microstructure and mechanical properties. The MoNbRe0.5TaW alloy has a single body-centered-cubic (BCC) solid solution when melting metal bulks. When melting the mixture of metal powders at the same process parameters, this alloy consists of BCC solid solution and oxide particle phase. However, the particle phase disappears and the alloy turns to single BCC phase as increasing the re-melted times. The formation and element segregation of the BCC solid solution match well with the computer-aided thermodynamic calculation. The precipitation of metastable oxide particles is mainly due to the oxidation of powders originated from their high surface energy. The MoNbRe0.5TaW alloy with oxide phase shows high Vickers micro-hardness of 5674 ± 92 MPa, high yield strength of 1145 ± 10 MPa and ultimate compressive strength of 1324 ± 18 MPa. The strength mechanism is Orawan strengthening. This study provides guidance for the design and preparation of high-entropy alloys with high performance.
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