The activity of non-basal slip systems and dynamic recovery at room temperature in fine-grained AZ31B magnesium alloys

J. Koike, T. Kobayashi, T. Mukai, H. Watanabe, M. Suzuki, K. Maruyama, K. Higashi

Research output: Contribution to journalArticlepeer-review

1054 Citations (Scopus)

Abstract

Fine-grained alloys of Mg-3Al-1Zn-0.2Mn in wt.% (AZ31B) were obtained by an equal-channel angular extrusion technique and subsequent annealing at elevated temperatures. Tensile tests were performed at room temperature at a strain rate of 1 × 10- 3 s- 1. The alloys exhibited an apparent steady-state deformation region and a large tensile elongation of 47%. The deformed microstructure at an elongation of 2% indicated substantial cross-slip to non-basal planes induced by plastic compatibility stress associated with grain boundaries. The non-basal segment of dislocations was found to consist of 40% of the total dislocation density at a yield anisotropy factor of only 1.1 instead of an expected value of 100 obtained from single-crystal experiments. The deformed microstructure at an elongation of 16% indicated recovered regions within twins as well as untwinned matrices. These results indicate that dynamic recovery can occur in Mg alloys at room temperature.

Original languageEnglish
Pages (from-to)2055-2065
Number of pages11
JournalActa Materialia
Volume51
Issue number7
DOIs
Publication statusPublished - 2003 Apr 18

Keywords

  • Dislocations
  • Magnesium
  • Mechanical properties
  • Microstructure

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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