Abstract
• A new TRIP high entropy alloy with precipitation strengthing was designed. • The yield strength is 700 MPa and the uniform elongation is close to 60%. • The nucleation of HCP phase from ∑3 TB and SFs was confirmed on the atomic scale. Transformation-induced plasticity (TRIP) endows material with continuous work hardening ability, which is considered as a powerful weapon to break the strength-ductility tradeoff. However, FCC based alloys with TRIP effect can not get rid of the “soft” feature of the structure entirely, resulting in insufficient yield strength. Here, a Co x Cr 25 (AlFeNi) 75- x high-entropy alloy is designed. NiAl phase is used as strengthening component to improve yield strength, while TRIP effect ensures plasticity. Compared with the previous TRIP high-entropy alloy, its yield strength is nearly doubled, and the uniform elongation is more than 55% at room temperature. Furthermore, the corresponding multiphase microstructure evolution and deformation mechanisms are investigated. Significantly, stacking faults and ∑3 twin boundaries are confirmed to be the nucleation sites of HCP phase by HAADF-STEM. Ingenious composition design and proper heat treatment process make it a perfect combination of precipitation strengthening and transformation-induced plasticity, and thus guide design in the high-performance alloy.
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