Special nanostructures in Al-Mg alloys subjected to high pressure torsion

Man Ping Liu, Hans J. Roven, Xin Tao Liu, Maxim Murashkin, Ruslan Z. Valiev, T. Ungár, L. Balogh

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Deformation twins and stacking faults were observed in nanostructure Al-Mg alloys subjected to high pressure torsion. These observations are surprising because deformation twinnings have never been observed in their coarse-grained counterparts under normal conditions. Experimental evidences are introduced on non-equilibrium grain boundaries, deformation twinnings and partial dislocation emissions from grain boundaries. Some of these features can be explained by the results reported from molecular-dynamics simulations of pure FCC metals. Special emphasis is laid on the recent observations of high density hexagonal and rhombic shaped nanostructures with an average size of 3 nm in the Al-Mg alloys processed by high pressure torsion. A possible formation process of these nanostructures is proposed based on molecular-dynamics simulations.

Original languageEnglish
Pages (from-to)2051-2056
Number of pages6
JournalTransactions of Nonferrous Metals Society of China (English Edition)
Volume20
Issue number11
DOIs
Publication statusPublished - Nov 2010

Fingerprint

torsion
Torsional stress
Nanostructures
twinning
Twinning
grain boundary
Molecular dynamics
Grain boundaries
grain boundaries
molecular dynamics
Computer simulation
Stacking faults
Dislocations (crystals)
dislocation
stacking
crystal defects
simulation
Metals
metal
metals

Keywords

  • aluminum alloys
  • deformation twinning
  • grain boundary structure
  • high pressure torsion
  • nanostructures
  • severe plastic deformation

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Materials Chemistry
  • Metals and Alloys
  • Condensed Matter Physics

Cite this

Special nanostructures in Al-Mg alloys subjected to high pressure torsion. / Liu, Man Ping; Roven, Hans J.; Liu, Xin Tao; Murashkin, Maxim; Valiev, Ruslan Z.; Ungár, T.; Balogh, L.

In: Transactions of Nonferrous Metals Society of China (English Edition), Vol. 20, No. 11, 11.2010, p. 2051-2056.

Research output: Contribution to journalArticle

Liu, Man Ping ; Roven, Hans J. ; Liu, Xin Tao ; Murashkin, Maxim ; Valiev, Ruslan Z. ; Ungár, T. ; Balogh, L. / Special nanostructures in Al-Mg alloys subjected to high pressure torsion. In: Transactions of Nonferrous Metals Society of China (English Edition). 2010 ; Vol. 20, No. 11. pp. 2051-2056.
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