首页|Superb strengthening behavior in a precipitation strengthened Co-rich CoCrNiAlTi medium entropy alloy with acceptable ductility
Superb strengthening behavior in a precipitation strengthened Co-rich CoCrNiAlTi medium entropy alloy with acceptable ductility
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NSTL
Elsevier
For metallic materials, it is challenged to enhance the strain hardening rate under uniaxial tension when high flow stress is achieved. Here, we present a strategy enabling to obtain superior strain hardening ability via fabricating an incompletely recrystallized structure in a precipitation-strengthened Co-rich CoCrNiAlTi mediumentropy alloy. It involves to introduce a low-temperature ageing process in the CoCrNiAlTi alloy experienced high-strain cold rolling process. Accompanied with the formation of the partially recrystallized microstructure, high-density band-like L12-type ordered phase has formed via discontinuous precipitation. During the plastic straining process, deformation twins have been triggered by the high-stress field owing to its metastable structure. As expected, the alloy demonstrates synergistically substantial strengthening and toughening effects, thus, a superb mechanical property combination with ultimate tensile stress of 2.20 GPa and ductility of over 5.0% has been achieved at ambient temperature.
Co-Cr-Ni base Medium-entropy alloyMechanical propertiesStrengthening mechanismTwinning behaviorMECHANICAL-PROPERTIESFRICTION STRESSPLANAR-SLIPDEFORMATIONNANOCRYSTALLINEDISLOCATIONSTEELMICROSTRUCTUREEVOLUTIONMETALS
Du, X. H.、Gai, Y. H.、Li, W. P.、Chou, T. H.、Huang, J. C.、Shi, C. X.、Duan, G. S.、Wu, B. L.
NSTL
Elsevier
