Role of severe plastic deformation on the cyclic reversibility of a Ti 50.3Ni33.7Pd16 high temperature shape memory alloy

B. Kockar, K. C. Atli, J. Ma, M. Haouaoui, I. Karaman, M. Nagasako, R. Kainuma

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

The present work focuses on the effect of microstructural refinement on the thermo-mechanical cyclic stability of a Ti50.3Ni 33.7Pd16 high temperature shape memory alloy (HTSMA) which was severe plastically deformed using equal channel angular extrusion (ECAE). The grain/subgrain size of the high temperature austenite phase was refined down to about 100 nm, the lowest reported to date in HTSMAs. The increase in strength differential between the onset of transformation and the macroscopic plastic yielding after ECAE led to a notable enhancement in the cyclic stability during isobaric cooling-heating experiments. The reduction in irrecoverable strain levels was attributed to the increase in critical stress for dislocation slip due to the microstructural refinement during the ECAE process.

Original languageEnglish
Pages (from-to)6411-6420
Number of pages10
JournalActa Materialia
Volume58
Issue number19
DOIs
Publication statusPublished - 2010 Nov 1

Keywords

  • Equal channel angular extrusion
  • Equal channel angular pressing
  • High temperature shape memory alloys
  • Severe plastic deformation
  • TiNiPd

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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