Dislocation substructures in tensile deformed Fe–Mn–Al–C steel

• Published in: Materials letters Vol. 282; p. 128691
• Main Authors: Riaz, T., Das, S.R., Sahu, T., Chakraborti, P.C., Sahu, P.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01-01-2021; Elsevier BV
• Subjects: Aluminum; Deformation and fracture; Deformation effects; Deformation twinning; Dislocations; Electron microscopy; Iron; Manganese; Materials science; Metals and alloys; Microstructure; Strain hardening; Substructures; Twinning; Deformation twinning; Metals and alloys; Deformation and fracture; Electron microscopy; Microstructure
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2020.128691

•Three-stage high strain hardening is observed in high-Mn steel.•Dislocation plasticity overwhelm the contribution of twins.•Deformation twins form in dislocation free regions.
Microstructure of a Fe–25Mn–2Al–0.1C steel studied under uniaxial tension revealed a gradually decreasing three-stage strain hardening behavior. Early deformation microstructure comprised of dislocations configurations; like Taylor lattice and stair-rod dislocations. Deformation twinning nucleated in regions lacking homogenous dislocation substructure. Dislocations cells and fine twin bundles were observed near failure strain. The strain hardening was a concomitant effect of deformation twins and dislocation substructure, while the contribution of dislocations seems to overwhelm the contribution from twinning.