Abstract
AbstractStrength-ductility trade-off in metals is sever under dynamic loading due to the strain rate effect and adiabatic shear failure. Here, we demonstrate that both strength and ductility progressively increase with increasing strain rate in a body-centered cubic TiZrNbTa refractory high-entropy alloy. We find that a prominent strain rate effect occurs, with a yield strength of 1879 ± 10 MPa at a strain rate of 6500 s−1, which is double that compared to a strain rate of 10−3 s−1. Simultaneously, Zr- and (Nb, Ta)-enriched local chemical ordering stimulates dislocation slip, enhancing homogeneous deformation capacity and adiabatic shear resistance under high strain rates. These findings suggest the importance of local chemical ordering to the dynamic properties of high-entropy alloys, and offer a way to develop metallic materials with improved dynamic mechanical properties.
Funder
the Postgraduate Scientific Research Innovation Project of Hunan Province
National Natural Science Foundation of China
the Fundamental Research Funds for the Central Universities
the National key research and development program
Publisher
Springer Science and Business Media LLC
Subject
Mechanics of Materials,General Materials Science
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