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dc.contributor.authorQiao, Lingen_US
dc.contributor.authorRamanujan, Raju V.en_US
dc.contributor.authorZhu, Jingchuanen_US
dc.identifier.citationQiao, L., Ramanujan, R. V. & Zhu, J. (2022). Optimized hot working parameters of Fe2.5Ni2.5CrAl multi-principal element alloys. Journal of Alloys and Compounds, 925, 166594-.
dc.description.abstractThe hot compressive deformation behavior of Co-free Fe2.5Ni2.5CrAl multi-principal element alloys (MPEAs) was investigated in the temperature and strain rate ranges of 800–1100∘C and 0.001 s−1 and 1 s−1, respectively. Microstructural observations were carried out by optical microscopy (OM) and electron backscatter diffraction (EBSD). A constitutive model based flow-stress analysis was carried out, the activation energy (Q) was obtained as 315.9 kJ/mol at steady state. The strain rate sensitivity (m), the power dissipation (η), and instability parameter (ξ) were utilized to construct the processing maps. Power-law breakdown and unstable flow occurred at the high strain rates at which strain hardening was pronounced. The optimal condition for successful hot working was determined to be at strain rates in the range of 10−2–10−3 s−1 and a temperature range of 850 ~ 1020∘C. FEM simulations revealed the strain and stress distribution during hot deformation and predicted instabilities during hot forming. The main deformation mechanism was dislocation climb with a stress exponent n > 5. The Q value for plastic flow in the power-law creep regime was calculated considering the effect of lattice diffusion of atoms and was in accordance with the measured Q value. Thus, our study revealed the hot working characteristics and the optimum processing parameters for successful hot working of Fe2.5Ni2.5CrAl MPEAs.en_US
dc.description.sponsorshipAgency for Science, Technology and Research (A*STAR)en_US
dc.relation.ispartofJournal of Alloys and Compoundsen_US
dc.rights© 2022 Elsevier B.V. All rights reserved.en_US
dc.titleOptimized hot working parameters of Fe2.5Ni2.5CrAl multi-principal element alloysen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Materials Science and Engineeringen_US
dc.subject.keywordsConstitutive Equationen_US
dc.subject.keywordsHot Deformation Behavioren_US
dc.description.acknowledgementThis work is supported by AME Programmatic Fund by the Agency for Science, Technology and Research, Singapore under Grants No. A1898b0043 and A18B1b0061 and the China Scholarship Council.en_US
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