Effect of indentation size on plastic deformation processes in an ultrafine-grained Al-3% Mg alloy

Zs Kovács, N. Q. Chinh, J. Lendvai, Z. Horita, T. G. Langdon

Research output: Contribution to journalConference article

5 Citations (Scopus)

Abstract

An Al-3% Mg alloy was processed by Equal Channel Angular Pressing (ECAP) for 8 passes in route BC thereby reducing the grain size of the annealed sample from ∼400 μm to ∼300 nm. The as-pressed ultrafine-grained material was examined using depth-sensing indentation tests over different length scales with the overall objective of identifying the different deformation processes taking place in the bulk submicrometer crystalline material. At small indentation sizes with indentation depths of <1000 nm, plastic instabilities in the form of the Portevin-Le Châtelier (PLC) effect were observed in the as-pressed material. At the macroscopic scale, however, the alloy exhibited no PLC instabilities thereby suggesting that dislocation motion then makes only a limited contribution to the plastic deformation and the flow is controlled instead by another mechanism associated with the presence of a very large number of grain boundaries.

Original languageEnglish
Pages (from-to)1073-1078
Number of pages6
JournalMaterials Science Forum
Volume396-402
Issue number2
Publication statusPublished - Dec 2 2002
EventAluminium Alloys 2002 Their Physical and Mechnaical Properties: Proceedings of the 8th International Conference ICAA8 - Cambridge, United Kingdom
Duration: Jul 2 2002Jul 5 2002

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All Science Journal Classification (ASJC) codes

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

Cite this

Kovács, Z., Chinh, N. Q., Lendvai, J., Horita, Z., & Langdon, T. G. (2002). Effect of indentation size on plastic deformation processes in an ultrafine-grained Al-3% Mg alloy. Materials Science Forum, 396-402(2), 1073-1078.