dc.identifier.uri |
http://dx.doi.org/10.15488/2328 |
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dc.identifier.uri |
http://www.repo.uni-hannover.de/handle/123456789/2354 |
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dc.contributor.author |
Maier, Hans Jürgen
|
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dc.contributor.author |
Karsten, Elvira
|
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dc.contributor.author |
Paulsen, Alexander
|
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dc.contributor.author |
Langenkämper, Dennis
|
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dc.contributor.author |
Decker, Peer
|
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dc.contributor.author |
Frenzel, Jan
|
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dc.contributor.author |
Somsen, Christoph
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dc.contributor.author |
Ludwig, Alfred
|
|
dc.contributor.author |
Eggeler, Gunther
|
|
dc.contributor.author |
Niendorf, Thomas
|
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dc.date.accessioned |
2017-11-17T09:49:37Z |
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dc.date.available |
2018-08-08T22:05:03Z |
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dc.date.issued |
2017 |
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dc.identifier.citation |
Maier, H.J.; Karsten, E.; Paulsen, A.; Langenkämper, D.; Decker, P. et al.: Microstructural evolution and functional fatigue of a Ti–25Ta high-temperature shape memory alloy. In: Journal of Materials Research 23 (2017), S. 4287-4295. DOI: https://doi.org/10.1557/jmr.2017.319 |
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dc.description.abstract |
Titanium–tantalum based alloys can demonstrate a martensitic transformation well above 100 °C, which makes them attractive for shape memory applications at elevated temperatures. In addition, they provide for good workability and contain only reasonably priced constituents. The current study presents results from functional fatigue experiments on a binary Ti–25Ta high-temperature shape memory alloy. This material shows a martensitic transformation at about 350 °C along with a transformation strain of 2 pct at a bias stress of 100 MPa. The success of most of the envisaged applications will, however, hinge on the microstructural stability under thermomechanical loading. Thus, light and electron optical microscopy as well X-ray diffraction were used to uncover the mechanisms that dominate functional degradation in different temperature regimes. It is demonstrated the maximum test temperature is the key parameter that governs functional degradation in the thermomechanical fatigue tests. Specifically, ω-phase formation and local decomposition in Ti-rich and Ta-rich areas dominate when T max does not exceed ≈430 °C. As T max is increased, the detrimental phases start to dissolve and functional fatigue can be suppressed. However, when T max reaches ≈620 °C, structural fatigue sets in, and fatigue life is again deteriorated by oxygen-induced crack formation. Copyright © Materials Research Society 2017 |
eng |
dc.language.iso |
eng |
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dc.publisher |
Cambridge : Cambridge University Press |
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dc.relation.ispartofseries |
Journal of Materials Research 2017 (2017) |
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dc.rights |
Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden. Dieser Beitrag ist aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich. |
|
dc.subject |
functional degradation |
eng |
dc.subject |
martensite |
eng |
dc.subject |
memory metal |
eng |
dc.subject |
omega phase |
eng |
dc.subject |
phase transformation |
eng |
dc.subject |
shape memory effect |
eng |
dc.subject |
Ti |
eng |
dc.subject |
Fatigue of materials |
eng |
dc.subject |
Fatigue testing |
eng |
dc.subject |
Martensite |
eng |
dc.subject |
Martensitic transformations |
eng |
dc.subject |
Phase transitions |
eng |
dc.subject |
Photodegradation |
eng |
dc.subject |
Shape memory effect |
eng |
dc.subject |
Tantalum alloys |
eng |
dc.subject |
Titanium |
eng |
dc.subject |
X ray diffraction |
eng |
dc.subject |
Elevated temperature |
eng |
dc.subject |
High temperature shape memory alloy |
eng |
dc.subject |
Microstructural stability |
eng |
dc.subject |
Omega phase |
eng |
dc.subject |
Shape memory applications |
eng |
dc.subject |
Thermo mechanical fatigues (TMF) |
eng |
dc.subject |
Thermo-mechanical loading |
eng |
dc.subject |
Transformation strain |
eng |
dc.subject |
Metal implants |
eng |
dc.subject.ddc |
620 | Ingenieurwissenschaften und Maschinenbau
|
ger |
dc.title |
Microstructural evolution and functional fatigue of a Ti–25Ta high-temperature shape memory alloy |
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dc.type |
Article |
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dc.type |
Text |
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dc.relation.issn |
0884-2914 |
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dc.relation.doi |
https://doi.org/10.1557/jmr.2017.319 |
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dc.bibliographicCitation.volume |
23 |
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dc.bibliographicCitation.firstPage |
4287 |
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dc.bibliographicCitation.lastPage |
4295 |
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dc.description.version |
publishedVersion |
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tib.accessRights |
frei zug�nglich |
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