Grain boundary structure in Al–Mg and Al–Mg–Sc alloys after equal-channel angular pressing

Keiichiro Oh-ishi, Zenji Horita, David J. Smith, Terence G. Langdon

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

Samples of an Al-3% Mg alloy and an Al-3% Mg-0.2% Sc alloy were subjected to equal-channel angular pressing (ECAP) to reduce the grain size to approximately 0.2-0.3 μm. Some samples of each alloy were also annealed for 1 h at temperatures of either 423 or 673 K, respectively. High-resolution electron microscopy was used to examine the microstructure both before and after annealing. The grain boundaries after ECAP were wavy and faceted and in high-energy nonequilibrium configurations. These results were consistent with earlier observations of materials subjected to severe plastic deformation using high-pressure torsion. In addition, some grain boundaries in the Al-Mg-Sc alloy had a zigzag appearance after annealing at 673 K, where the straight portions of the boundary were identified as low-energy (111) planes. It is suggested these are mobile boundaries lying in a lowest energy configuration where mobility may be restricted by the presence of incoherent Al3Sc particles.

Original languageEnglish
Pages (from-to)583-589
Number of pages7
JournalJournal of Materials Research
Volume16
Issue number2
DOIs
Publication statusPublished - Feb 2001

Fingerprint

Equal channel angular pressing
pressing
Grain boundaries
grain boundaries
Annealing
annealing
High resolution electron microscopy
configurations
Torsional stress
plastic deformation
torsion
energy
Plastic deformation
electron microscopy
grain size
microstructure
Microstructure
high resolution
Temperature
temperature

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Grain boundary structure in Al–Mg and Al–Mg–Sc alloys after equal-channel angular pressing. / Oh-ishi, Keiichiro; Horita, Zenji; Smith, David J.; Langdon, Terence G.

In: Journal of Materials Research, Vol. 16, No. 2, 02.2001, p. 583-589.

Research output: Contribution to journalArticle

Oh-ishi, Keiichiro ; Horita, Zenji ; Smith, David J. ; Langdon, Terence G. / Grain boundary structure in Al–Mg and Al–Mg–Sc alloys after equal-channel angular pressing. In: Journal of Materials Research. 2001 ; Vol. 16, No. 2. pp. 583-589.
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