首页|The critical grain size for optimal strength-ductility synergy in CrCoNi medium entropy alloy
The critical grain size for optimal strength-ductility synergy in CrCoNi medium entropy alloy
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NSTL
Elsevier
In metals with homogeneous microstructure, whether there is a critical grain size, and exactly at which, that enables the optimal strength-ductility synergy alongside the trade-off relation? Here, this issue is investigated in the recrystallized CrCoNi medium entropy alloys across a wide grain size range of 0.23-108 mu m. Results reveal that there is indeed a critical grain size of-2 mu m at which the product of yield strength (-800 MPa) and uniform elongation (>30%) reaches the maximum, i.e., achieving the optimal strength-ductility synergy. Physics behind this critical grain size are explored by microstructure examination: (i) reduced grain size renders short dislo-cation slip path for high strength; (ii) low initial dislocation density and dense grain/twin boundaries enables effective accumulation of defects for consistent work hardening during plastic deformation.
Grain size effectFine-grained structureStrength and ductilityStrain hardeningStacking faultsSTACKING-FAULT ENERGYDEFORMATIONNANOPARTICLESSTRESS
Guo, F. J.、Wang, Y. F.、Wang, M. S.、Wei, W.、He, Q.、Wang, Q. Y.、Jin, R. R.、Huang, C. X.
NSTL
Elsevier
