Abstract
We report the tensile properties and microstructural evolution of a high entropy alloy (FeCoCr)40Ni40Al10Cu10 deformed at low temperature (233K) and room temperature (293 K). The alloy presented a superior combination of tensile strength (~1200 MPa) and elongation (~36%) at 233 K than at 293 K. Transmission electron microscopy revealed that the enhanced tensile properties at low temperature were due to deformation twinning, the formation of immobile Lomer-Cottrell dislocation locks, and the high density coherent nano-precipitates.
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