Grain boundary structure and deformation defects in nanostructured Al-Mg alloys processed by high pressure torsion

Ping Liu Man, Hans J. Roven, Tamas Ungár, Levente Balogh, Maxim Murashkin, Ruslan Z. Valiev

Research output: Chapter in Book/Report/Conference proceedingConference contribution

9 Citations (Scopus)

Abstract

An Al-0.5 Mg alloy and a commercial AA5182 alloy were subjected to high pressure torsion (HPT) to five turns under pressure of 6 GPa at room temperature. The grain boundary structure and deformation defects were investigated after HPT using high-resolution transmission electron microscopy (HRTEM). Low-angle, high-angle, equilibrium and non-equilibrium grain/subgrain boundaries, twin boundaries, full dislocations, dipoles, microtwins and stacking faults were identified by HRTEM. Extrinsic 60° dislocations in the form of dipoles were frequently observed in non-equilibrium grain/subgrain boundaries. In addition subgrain size distributions and dislocation densities were quantified by x-ray line profile analysis. It was observed that the average grain size decreased from about 120 nm to 55 nm as the Mg content increased from 0.5 to 4.1 wt%. Concomitantly the average stored dislocation density increased from 1.7 to 12.8 × 1014 m-2. Based on the HRTEM investigations and the x-ray line profile analyses, the deformation mechanism associated with the typical grain boundaries and deformation defects in the aluminium alloys were discussed.

Original languageEnglish
Title of host publicationMaterials Science Forum - Nanomaterials by Severe Plastic Deformation 4 - 4th International Conference on Nanomaterials by Severe Plastic Deformation
EditorsYuri Estrin, Yuri Estrin, Hans Jurgen Maier
PublisherTrans Tech Publications Ltd
Pages528-534
Number of pages7
ISBN (Print)9770255547605, 9780878493753
Publication statusPublished - Jan 1 2008
Event4th International Conference on Nanomaterials by Severe Plastic Deformation - Goslar, Germany
Duration: Aug 18 2008Aug 22 2008

Publication series

NameMaterials Science Forum
Volume584-586 PART 1
ISSN (Print)0255-5476

Other

Other4th International Conference on Nanomaterials by Severe Plastic Deformation
CountryGermany
CityGoslar
Period8/18/088/22/08

Keywords

  • Aluminium alloys
  • Deformation defects
  • Grain boundary structure
  • High pressure torsion
  • Non-equilibrium grain boundaries
  • Severe plastic deformation

ASJC Scopus subject areas

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

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  • Cite this

    Man, P. L., Roven, H. J., Ungár, T., Balogh, L., Murashkin, M., & Valiev, R. Z. (2008). Grain boundary structure and deformation defects in nanostructured Al-Mg alloys processed by high pressure torsion. In Y. Estrin, Y. Estrin, & H. J. Maier (Eds.), Materials Science Forum - Nanomaterials by Severe Plastic Deformation 4 - 4th International Conference on Nanomaterials by Severe Plastic Deformation (pp. 528-534). (Materials Science Forum; Vol. 584-586 PART 1). Trans Tech Publications Ltd.