Plastic deformation of icosahedral Al-Pd-Mn single quasicrystals to large strains I. Experiments

E. Kabutoya, R. Tamura, S. Takeuchl, K. Edagawa, J. Q. Guo, A. P. Tsai

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Icosahedral Al-Pd-Mn single quasicrystals, grown by the Czochralski method, were deformed in compression along a twofold direction to large strains. The true stress versus true strain curves showed three stages: the initial work-hardening stage, a large work-softening stage followed by a weak workhardening stage. The minimum flow stress was about half the maximum flow stress. The stress relaxation experiments showed temperature-dependent activation volume versus applied stress relations. Assuming that the flow stress is composed of the effective stress, the temperature-dependent dragging stress and the internal stress, the effective stress dependence of the activation enthalpy was analysed for both the maximum-flow-stress state and the minimum-flow-stress state. The activation enthalpy of the latter state was found to be about 20% smaller than the former state, and the work softening is due to a decrease in the activation enthalpy with increasing plastic strain.

Original languageEnglish
Pages (from-to)369-377
Number of pages9
JournalPhilosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties
Volume82
Issue number2
DOIs
Publication statusPublished - 2002 Jan
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Science(all)
  • Condensed Matter Physics
  • Physics and Astronomy (miscellaneous)
  • Metals and Alloys

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