Abstract
A NbMoTaWV high entropy alloy (HEA) was fabricated by mechanical alloying (MA) and spark plasma sintering (SPS). Characterization of milled powders indicated that only a single body-centered cubic (BCC) solid solution phase was generated in the MA process. After SPS, a tetragonal (Ta,V)O2 oxide phase precipitated from the primary BCC phase. The NbMoTaWV alloy exhibited a compressive yielding strength (σy) of 2785 MPa, compressive strength (σmax) of 3661 MPa and strain to failure (εf) of 16.2% at room temperature. The compressive yielding strength of the sintered alloy was dramatically higher compared with most previously reported HEAs. The compressive strength of NbMoTaWV alloy at 1000 °C arrived at 1978 MPa. The excellent strength at room and elevated temperatures are mostly ascribed to the fine (Ta,V)O2 particles dispersed in the BCC matrix.
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