Tension - compression asymmetry in co49Ni49Ga49high-temperature shape memory alloy single crystals

T. Niendorf, J. Dadda, J. Lackmann, J. A. Monroe, I. Karaman, E. Panchenko, H. E. Karaca, H. J. Maier

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

9 Scopus citations

Abstract

This paper reports on the tension-compression asymmetry of [001]-oriented Co49Ni21Ga30 single crystals at elevated temperatures. Maximum strains of -4.8 % and 8.6 % in compression and tension, respectively, were found. A linear Clausius-Clapeyron relationship was observed for both stress-states where the smaller slope in tension resulted in a significant increase of the phase transformation temperatures with stress, which reached 180 °C under a constant stress level of 150 MPa. In addition, the material demonstrated a large pseudoelastic temperature range of about 300 °C under both stress state conditions. The results in this study unequivocally indicate the potential of these alloys for applications where elevated temperatures and stress levels prevail.

Original languageEnglish
Title of host publicationEuropean Symposium on Martensitic Transformations, ESOMAT 2012
EditorsSergey Prokoshkin, Natalia Resnina
Pages82-86
Number of pages5
DOIs
StatePublished - 2013
Event9th European Symposium on Martensitic Transformations, ESOMAT 2012 - Saint-Petersburg, Russian Federation
Duration: Sep 9 2012Sep 16 2012

Publication series

NameMaterials Science Forum
Volume738-739
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Conference

Conference9th European Symposium on Martensitic Transformations, ESOMAT 2012
Country/TerritoryRussian Federation
CitySaint-Petersburg
Period9/9/129/16/12

Keywords

  • Internal friction
  • Martensite variants
  • Martensitic phase transformation
  • Nucleation
  • Phase
  • phase transformation
  • Shape memory alloys (SMA)

ASJC Scopus subject areas

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

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