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.

References

Page 1

	Year	Citations
High temperature shape memory alloys Ji Ma, İbrahim Karaman, R.D. Noebe International Materials Reviews Materials EngineeringMaterials ScienceMartensitic Transformation TemperaturesMagnetic Shape Memory AlloysHigh Temperature Materials	2010	982
Phase Equilibria and Phase Transformations in New B2-type Ferromagnetic Shape Memory Alloys of Co-Ni-Ga and Co-Ni-Al Systems Katsunari Oikawa, Takuya Ota, Fumihiko Gejima, MATERIALS TRANSACTIONS Magnetic PropertiesEngineeringPhase EquilibriaMagnetic MaterialsMagnetism	2001	277
High-temperature shape memory alloys G. S. Firstov, J. Van Humbeeck, Yu. N. Koval Materials Science and Engineering A Materials EngineeringMaterials ScienceMagnetic Shape Memory AlloysEngineeringAlloy Design	2004	273
Comparison of high temperature shape memory behaviour for ZrCu-based, Ti–Ni–Zr and Ti–Ni–Hf alloys G. S. Firstov, J. Van Humbeeck, Yu. N. Koval Scripta Materialia Materials EngineeringMaterials ScienceMagnetic PropertiesHigh Temperature MaterialsEngineering	2003	147
Superelasticity in high-temperature Ni–Mn–Ga alloys V. A. Chernenko, Victor A. L’vov, J. Pons, Journal of Applied Physics Materials EngineeringMaterials ScienceMartensitic Transformation TemperaturesHigh Temperature MaterialsEngineering	2003	143
A high-temperature shape-memory alloy Ni54Mn25Ga21 Huibin Xu, Yunqing Ma, Chengbao Jiang Applied Physics Letters Materials EngineeringMaterials ScienceMagnetic Shape Memory AlloysHigh Temperature MaterialsEngineering	2003	120
Detwinning in NiTi alloys Hüseyin Şehitoğlu, Reginald F. Hamilton, D. Canadinç, Metallurgical and Materials Transactions A Materials ScienceMaterials EngineeringNiti AlloysEngineeringCorrosion	2003	108
Pseudoelasticity at elevated temperatures in [001] oriented Co49Ni21Ga30 single crystals under compression J. Dadda, Hans Jürgen Maier, İbrahim Karaman, Scripta Materialia Materials ScienceElevated TemperaturesEngineeringSevere Plastic DeformationCo49ni21ga30 Single Crystals	2006	89
Stabilisation of martensite by applying compressive stress in Cu-Al-Ni single crystals C. Picornell, J. Pons, E. Cesari Acta Materialia Materials ScienceCompressive StressEngineeringSevere Plastic DeformationApplied Physics	2001	80
Pseudoelasticity and Cyclic Stability in Co49Ni21Ga30 Shape-Memory Alloy Single Crystals at Ambient Temperature J. Dadda, Hans Jürgen Maier, D. Niklasch, Metallurgical and Materials Transactions A Materials EngineeringMaterials ScienceEngineeringSevere Plastic DeformationCrystal Material	2008	70

Page 1