Journal
INTERMETALLICS
Volume 146, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.intermet.2022.107582
Keywords
Co-Cr-Ni base Medium-entropy alloy; Mechanical properties; Strengthening mechanism; Twinning behavior
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Funding
- Science and Technology Agency of Liaoning province, P.R. China [2020 JH2/107]
- City University of Hong Kong [9380088, 7005078, 9380092]
- CityU grant [9360161]
- GRF grant [C1027-14E]
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By introducing a low-temperature ageing process in the CoCrNiAlTi alloy and fabricating a partially recrystallized structure, the strain hardening ability of the alloy is significantly improved. The formation of high-density band-like L12 phase and deformation twins contribute to the superb mechanical property combination achieved.
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.
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