scholarly journals Role of applied stress level on the actuation fatigue behavior of NiTiHf high temperature shape memory alloys

2018 ◽  
Vol 153 ◽  
pp. 156-168 ◽  
Author(s):  
O. Karakoc ◽  
C. Hayrettin ◽  
D. Canadinc ◽  
I. Karaman
Keyword(s):  
High Temperature ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Applied Stress ◽  
Stress Level ◽  
Fatigue Behavior

scholarly journals Cyclic degradation of titanium–tantalum high-temperature shape memory alloys — the role of dislocation activity and chemical decomposition

2015 ◽  
Vol 08 (06) ◽  
pp. 1550062 ◽  
Author(s):  
T. Niendorf ◽  
P. Krooß ◽  
C. Somsen ◽  
R. Rynko ◽  
A. Paulsen ◽  
...  
Keyword(s):  
High Temperature ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Elevated Temperatures ◽  
Nickel Titanium ◽  
Chemical Decomposition ◽  
Ω Phase ◽  
The Matrix ◽  
Cyclic Degradation

Titanium–tantalum shape memory alloys (SMAs) are promising candidates for actuator applications at elevated temperatures. They may even succeed in substituting ternary nickel–titanium high temperature SMAs, which are either extremely expensive or difficult to form. However, titanium–tantalum alloys show rapid functional and structural degradation under cyclic thermo-mechanical loading. The current work reveals that degradation is not only governed by the evolution of the ω-phase. Dislocation processes and chemical decomposition of the matrix at grain boundaries also play a major role.

Role of Fe addition in Ni–Mn–Ga–Co–Cu–Fe ferromagnetic shape memory alloys for high-temperature magnetic actuation

2020 ◽  
Vol 196 ◽  
pp. 549-555
Author(s):  
Anabel Pérez-Checa ◽  
Jose M. Porro ◽  
Jorge Feuchtwanger ◽  
Patricia Lázpita ◽  
Thomas C. Hansen ◽  
...  
Keyword(s):  
High Temperature ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Magnetic Actuation ◽  
Ferromagnetic Shape Memory Alloys ◽  
Ferromagnetic Shape Memory ◽  
Fe Addition

scholarly journals On the functional degradation of binary titanium–tantalum high-temperature shape memory alloys — A new concept for fatigue life extension

2014 ◽  
Vol 07 (04) ◽  
pp. 1450042 ◽  
Author(s):  
T. Niendorf ◽  
P. Krooß ◽  
E. Batyrsina ◽  
A. Paulsen ◽  
J. Frenzel ◽  
...  
Keyword(s):  
High Temperature ◽  
Fatigue Life ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Noble Metals ◽  
Elevated Temperatures ◽  
Fatigue Behavior ◽  
Life Extension ◽  
Promising Alternative ◽  
Cyclic Degradation

High-temperature shape memory alloys are promising candidates for actuator applications at elevated temperatures. Ternary nickel–titanium-based alloys either contain noble metals which are very expensive, or suffer from poor workability. Titanium–tantalum shape memory alloys represent a promising alternative if one can avoid the cyclic degradation due to the formation of the omega phase. The current study investigates the functional fatigue behavior of Ti – Ta and introduces a new concept providing for pronounced fatigue life extension.

Role of microstructure on the actuation fatigue performance of Ni-Rich NiTiHf high temperature shape memory alloys

2019 ◽  
Vol 175 ◽  
pp. 107-120 ◽  
Author(s):  
O. Karakoc ◽  
C. Hayrettin ◽  
A. Evirgen ◽  
R. Santamarta ◽  
D. Canadinc ◽  
...  
Keyword(s):  
High Temperature ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Fatigue Performance

Effects of training on the thermomechanical behavior of NiTiHf and NiTiZr high temperature shape memory alloys

2020 ◽  
Vol 794 ◽  
pp. 139857 ◽  
Author(s):  
O. Karakoc ◽  
K.C. Atli ◽  
A. Evirgen ◽  
J. Pons ◽  
R. Santamarta ◽  
...  
Keyword(s):  
High Temperature ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Thermomechanical Behavior

Role of Si in Improving the Shape Recovery of FeMnSiCrNi Shape Memory Alloys

2011 ◽  
Vol 42 (8) ◽  
pp. 2153-2165 ◽  
Author(s):  
Bikas C. Maji ◽  
Madangopal Krishnan ◽  
Gouthama ◽  
R. K. Ray
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Shape Recovery

scholarly journals Effect of Ni-Content on the Transformation Temperatures in NiTi-20 at. % Zr High Temperature Shape Memory Alloys

Metals ◽  
2017 ◽  
Vol 7 (11) ◽  
pp. 511 ◽  
Author(s):  
Matthew Carl ◽  
Jesse Smith ◽  
Brian Van Doren ◽  
Marcus Young
Keyword(s):  
High Temperature ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Transformation Temperatures ◽  
Ni Content
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