On the formation of hierarchical microstructure in a Mo-doped NiCoCr medium-entropy alloy with enhanced strength-ductility synergy

We demonstrate the formation of a hierarchical microstructure by optimized combination of Mo-doping and thermo-mechanical processing in a NiCoCr medium-entropy-alloy (MEA) that results in a significant improvement in yield-strength (~775 MPa) and ultimate-tensile-strength (~1200 MPa) with an elongat...

Full description

Saved in:
Bibliographic Details
Published inScripta materialia Vol. 175; pp. 1 - 6
Main Authors He, Junyang, Makineni, Surendra Kumar, Lu, Wenjun, Shang, Yuanyuan, Lu, Zhaoping, Li, Zhiming, Gault, Baptiste
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 15.01.2020
Subjects
Deformation twinning
Hierarchical microstructure
Medium entropy alloys
Partial recrystallization
Yield strength
Yield strength
Deformation twinning
Hierarchical microstructure
Medium entropy alloys
Partial recrystallization
Online AccessGet full text

Cover

More Information
Summary:We demonstrate the formation of a hierarchical microstructure by optimized combination of Mo-doping and thermo-mechanical processing in a NiCoCr medium-entropy-alloy (MEA) that results in a significant improvement in yield-strength (~775 MPa) and ultimate-tensile-strength (~1200 MPa) with an elongation to fracture up to 35%. Addition of Mo slows down the recrystallization kinetics of the cold-rolled alloy at 700 °C. After 4 h annealing, the microstructure comprises soft recrystallized and hard non-recrystallized zones, dispersed σ precipitates, annealing twins and retained stacking faults/nanotwins that are shown to contribute to the overall mechanical behavior. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2019.08.036