Details
| Original language | English |
|---|---|
| Article number | 1550062 |
| Journal | Functional materials letters |
| Volume | 8 |
| Issue number | 6 |
| Publication status | Published - 26 May 2015 |
Abstract
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.
Keywords
- decomposition, Microstructure, phase transformation, training, ω-phase
ASJC Scopus subject areas
- Materials Science(all)
- General Materials Science
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In: Functional materials letters, Vol. 8, No. 6, 1550062, 26.05.2015.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Cyclic degradation of titanium-tantalum high-temperature shape memory alloys
T2 - The role of dislocation activity and chemical decomposition
AU - Niendorf, T.
AU - Krooß, P.
AU - Somsen, C.
AU - Rynko, R.
AU - Paulsen, A.
AU - Batyrshina, E.
AU - Frenzel, J.
AU - Eggeler, G.
AU - Maier, H. J.
PY - 2015/5/26
Y1 - 2015/5/26
N2 - 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.
AB - 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.
KW - decomposition
KW - Microstructure
KW - phase transformation
KW - training
KW - ω-phase
UR - http://www.scopus.com/inward/record.url?scp=84946486452&partnerID=8YFLogxK
U2 - 10.1142/S1793604715500629
DO - 10.1142/S1793604715500629
M3 - Article
AN - SCOPUS:84946486452
VL - 8
JO - Functional materials letters
JF - Functional materials letters
SN - 1793-6047
IS - 6
M1 - 1550062
ER -