Tension - Compression Asymmetry in Co₄₉Ni₂₁Ga₃₀ High-Temperature Shape Memory Alloy Single Crystals

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.

• Periodical: Materials Science Forum (Volumes 738-739)
• Pages: 82-86
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.738-739.82
• Online since: January 2013
• Authors: Thomas Niendorf, Jayaram Dadda, Jan Lackmann, James A. Monroe, Ibrahim Karaman, Elena Panchenko, Haluk E. Karaca, Hans J. Maier
• Keywords: Internal Friction, Martensite Variants, Martensitic Phase Transformation, Nucleation, Phase Transformation, Shape Memory Alloy (SMA)

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