Abstract
Introducing nanotwins to metallic materials can significantly improve strength and ductility. Nanotwins exist in the shear band after high strain rate deformation in some NiCrFe-based alloys, while the formation mechanism of nanotwins has not been revealed. In this work, nanotwins appear in the shear band of NiCrFe medium-entropy alloy (MEA) and are investigated by a series of characterization. The thickness of nanotwins is 8 nm − 10 nm. The nanotwins are of a single face-centered cubic (FCC) phase without phase transformation. Combined with experiments and molecular dynamics (MD) simulation, formation mechanism of nanotwins in the shear band is revealed. These findings provide theoretical guidance for rapid preparation of nanotwinned MEAs.
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