High-temperature superelasticity and competing microstructural mechanisms in Co49Ni21Ga30 shape memory alloy single crystals under tension

2010 ◽  
Vol 62 (6) ◽  
pp. 368-371 ◽  
Author(s):  
J.A. Monroe ◽  
I. Karaman ◽  
H.E. Karaca ◽  
Y.I. Chumlyakov ◽  
H.J. Maier
Keyword(s):  
High Temperature ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Single Crystals

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

2013 ◽  
Vol 738-739 ◽  
pp. 82-86 ◽  
Author(s):  
Thomas Niendorf ◽  
Jayaram Dadda ◽  
Jan Lackmann ◽  
James A. Monroe ◽  
Ibrahim Karaman ◽  
...  
Keyword(s):  
Phase Transformation ◽  
High Temperature ◽  
Stress State ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Single Crystals ◽  
Stress Level ◽  
Elevated Temperatures ◽  
Stress States ◽  
Tension Compression Asymmetry

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.

scholarly journals Laser welding of H-phase strengthened Ni-rich NiTi-20Zr high temperature shape memory alloy

2021 ◽  
Vol 202 ◽  
pp. 109533
Author(s):  
J.P. Oliveira ◽  
Jiajia Shen ◽  
J.D. Escobar ◽  
C.A.F. Salvador ◽  
N. Schell ◽  
...  
Keyword(s):  
High Temperature ◽  
Shape Memory Alloy ◽  
Laser Welding ◽  
Shape Memory

Computational thermodynamics of the CoNiGa high temperature shape memory alloy system

Calphad ◽  
2014 ◽  
Vol 45 ◽  
pp. 167-177 ◽  
Author(s):  
Arpita Chari ◽  
Ebubekir Dogan ◽  
Anjana Talapatra ◽  
Avinash. R. Chivukula ◽  
Andres Garay ◽  
...  
Keyword(s):  
High Temperature ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Alloy System ◽  
Computational Thermodynamics

Compressive response of nickel-rich NiTiHf high-temperature shape memory single crystals along the [111] orientation

2011 ◽  
Vol 65 (7) ◽  
pp. 577-580 ◽  
Author(s):  
H.E. Karaca ◽  
S.M. Saghaian ◽  
B. Basaran ◽  
G.S. Bigelow ◽  
R.D. Noebe ◽  
...  
Keyword(s):  
High Temperature ◽  
Shape Memory ◽  
Single Crystals ◽  
Compressive Response
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