Contribution of coherent precipitates on mechanical properties of CoCrFeNiTi0.2 high-entropy alloy at room and cryogenic temperatures

In the present work, The L12-strengthened CoCrFeNiTi0.2 (at.%) high-entropy alloy (HEA) exhibit excellent tensile mechanical properties both at room temperature (293 K) and liquid nitrogen temperature (77 K). Especially at 77 K, the yield strength and ultimate tensile strength are about 900 MPa and 1500 MPa, respec-tively, and the elongation is markedly increased to 50%, realizing the most exceptional strength-plasticity synergy. Dislocation slips dominate at 293 K, whlie at 77 K, stacking faults assist plastic deformation. This strengthening strategy of coherent L12 precipitates provides the basic guidance for the development of high-performance alloys.

Automated summary

The L12-strengthened CoCrFeNiTi0.2 (at.%) high-entropy alloy exhibits excellent tensile mechanical properties at both room temperature and liquid nitrogen temperature. At 77 K, the alloy shows remarkable strength-plasticity synergy with a yield strength of about 900 MPa, ultimate tensile strength of 1500 MPa, and elongation of 50%. The strengthening strategy of coherent L12 precipitates provides guidance for the development of high-performance alloys.