Dynamic strain aging and twin formation during warm deformation of a novel medium-entropy lightweight steel

Rezvan Khani, A. Zarei-Hanzaki, A. Moshiri, H. R. Abedi, Seok Su Sohn

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


The present study deals with the extraordinary twin formation during compressive deformation of a Fe-37.55Mn-8.5Al-0.6C (wt.%) low-density steel at warm temperature regime (200–600 °C). Despite the conventional opinion regarding the restrictive effect of increasing temperature on the occurrence of deformation twinning, not only the twin boundary fraction did not decrease, but also twinning was encouraged at 400 °C and even 600 °C. This was discussed relying on the occurrence of dynamic strain aging phenomenon, which caused a bump in corresponding hardening rate curves. The medium entropy of the alloy, which made short-range diffusion of solute atoms feasible and facilitated local pinning of the mobile dislocations, provided a proper condition for the occurrence of high temperature strain ageing. Finally, the unbalanced pinning of trailing and leading dislocations influenced on their velocity and caused widening the stacking faults which in-turn could significantly assist deformation twinning at such high deformation temperatures.

Original languageEnglish
Pages (from-to)1628-1641
Number of pages14
JournalJournal of Materials Research and Technology
Publication statusPublished - 2022 Mar 1

Bibliographical note

Funding Information:
This work was supported by Korea Institute for Advancement of Technology (KIAT) grant funded by the Korea Government (MOTIE) (P0002019, Human Resource Development Program for Industrial Innovation).

Publisher Copyright:
© 2022 The Author(s)


  • Deformation twinning
  • Dynamic strain aging
  • Lightweight steel
  • Mechanical properties
  • Medium-entropy alloy
  • Thermomechanical processing

ASJC Scopus subject areas

  • Ceramics and Composites
  • Biomaterials
  • Surfaces, Coatings and Films
  • Metals and Alloys


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