Microstructural evolution in Mg-3Gd during accumulative roll-bonding

Xuan Luo, Zongqiang Feng, Tianbo Yu, Tianlin Huang, Rongguang Li, Guilin Wu*, Niels Hansen, Xiaoxu Huang

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

An Mg-3Gd (wt. %) alloy has been deformed by accumulative roll bonding through four cycles to an equivalent strain of 3.2. The deformed microstructure has been fully characterized by advanced electron microscopy techniques and the mechanical properties are determined by tensile testing. Three characteristic microstructures have been identified and characterized as: cell blocks, twin blocks and nanograins, all with
boundary spacings of 100-200 nm. These structures illustrate a structural subdivision by low angle dislocation boundaries and high angle boundaries, which shows a clear resemblance with deformation microstructures in fcc and bcc metals deformed to high strain. The structural evolution has its origin in dislocation and twinning based plasticity which is quantified. The structure-strength relationship of this low-alloyed Mg-3Gd is analysed.
Original languageEnglish
Article number138763
JournalMaterials Science and Engineering A
Volume772
ISSN0921-5093
DOIs
Publication statusAccepted/In press - 2020

Keywords

  • Mg alloy
  • Accumulative roll bonding
  • Grain subdivision
  • Microstructure
  • Mechanical properties

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