The synergy of boundary engineering and segregation strategy towards high strength and ductility Mg-3Gd alloy

Xuan Luo, Zongqiang Feng*, Rui Fu, Tianlin Huang, Guilin Wu, Xiaoxu Huang

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Nanostructured materials prepared by severe plastic deformation processing were puzzled by the trade-off between strength and ductility. With the synergy of boundary engineering and segregation strategy, a nanostructured Mg-3Gd (wt. %) alloy with simultaneously enhanced strength and ductility was fabricated by accumulative roll-bonding processing and subsequent annealing treatment. Based on transmission electron microscopy observations, clear evidences of Gd segregation at grain boundaries, twin boundaries, stacking faults and dislocations can be observed in annealed samples. Meanwhile, the activation of non-basal slip and intensive interaction between dislocations and Gd atoms were determined in the annealed sample after tensile testing. Boundary segregation and pinning of dislocations were considered to be the main reason for the strength enhancement, while the increase in ductility was attributed to the inhibition of premature failure by Gd segregation at twin boundaries and the activation of non-basal slip.
Original languageEnglish
Article number153051
JournalJournal of Alloys and Compounds
Volume819
Number of pages8
ISSN0925-8388
DOIs
Publication statusPublished - 2020

Keywords

  • Mg-3Gd alloy
  • Boundary engineering
  • Segregation
  • Non-basal slip
  • Mechanical properties

Cite this