Stress-Strain-Temperature Behavior of [001] Single Crystals of Co₄₉Ni₂₁Ga₃₀ Ferromagnetic Shape Memory Alloy under Compression

Jayaram Dadda (1) , Demircan Canadinc (2) , Hans Jürgen Maier (1) , Ibrahim Karaman (3) , Haluk Ersin Karaca (3) , Yuriy Ivanovich Chumlyakov (4)

1 Materials Science
2 Materials Science
3 Mechanical Engineering
4 Siberian Physical Technical Institute Tomsk State University

The conventional shape memory effect (SME) and pseudoelasticity (PE) in as grown [100] single crystals of Co₄₉Ni₂₁Ga₃₀ alloy under compression are reported. The parent single crystals exhibit about 5% transformation strain at compressive stress levels as low as 4 MPa, and a pseudoelastic strain of 4.5%. Complete PE was observed in the temperature range from 35 to 285 °C, along with increasing stress hysteresis with temperature. The latter is attributed to increasing number of variants and the corresponding variant-variant interactions. We demonstrate that the current material can be utilized in applications that demand high strength at elevated temperatures. Moreover, the current results also indicate the potential of this material to exhibit magnetic shape memory effect, which could broaden the scope of utility of this material upon further research.

Mots clés: Physical Sciences

Jayaram Dadda, Demircan Canadinc, Hans Jürgen Maier, Ibrahim Karaman, Haluk Ersin Karaca, et al.. Stress-Strain-Temperature Behavior of [001] Single Crystals of Co₄₉Ni₂₁Ga₃₀ Ferromagnetic Shape Memory Alloy under Compression. Philosophical Magazine, 2008, 87 (16), pp.2313-2322. ⟨10.1080/14786430601175524⟩. ⟨hal-00513814⟩