Abstract
In the current work, the coherent L12-phases-strengthened Co40Cr20Ni30Mo2Al4Ti4 (in atomic percent, at.%) high-entropy alloy (HEA) exhibits an excellent strength-plasticity synergy during dynamic tension. The diameter and volume fraction of L12 precipitates are about 7.8 nm and 9.85%, respectively. When the strain rate is 1700/s, the yield strength of the alloy is 950 MPa, the ultimate tensile strength is up to 1725 MPa, and the elongation remains at 40%. The plastic deformation of the alloy in a quasi-static state is dominated by dislocations. During dynamic tension, stacking faults contribute to the high strength and effective work hardening of the alloy as an additional deformation mechanism. The present work provides a basic theoretical guidance for understanding the dynamic-deformation behaviors and mechanisms of precipitation-strengthened HEAs.
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