Details
| Original language | English |
|---|---|
| Pages (from-to) | 181-190 |
| Number of pages | 10 |
| Journal | Shape Memory and Superelasticity |
| Volume | 6 |
| Issue number | 2 |
| Early online date | 22 May 2020 |
| Publication status | Published - Jun 2020 |
Abstract
The introduction of high-entropy alloys (HEA) into the field of shape memory alloys offers enormous potential for improving their functional properties. It is shown how a successive increase in chemical complexity results in strictly monotonically enlarged and increasingly distorted lattices. With increasing the number of elements added to the alloy, the effect of solid solution strengthening appears to be curtailed and first insights into the contribution of additional mechanisms based on lattice distortions are possible. The alloys developed in this study, reaching from ternary NiTiHf to senary TiZrHfCoNiCu, show a great potential to exploit interatomic interactions regarding improvement of functional fatigue. Despite the absence of stress plateaus related to detwinning, recovery effects at loads above 1000 MPa and significant strain recoveries are shown.
Keywords
- Compression tests, Functional degradation, High-entropy alloys (HEA), Mechanical behavior, NiTi, Shape memory alloys (SMA), X-ray diffraction (XRD)
ASJC Scopus subject areas
- Materials Science(all)
- Engineering(all)
- Mechanics of Materials
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In: Shape Memory and Superelasticity, Vol. 6, No. 2, 06.2020, p. 181-190.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - The effect of increasing chemical complexity on the mechanical and functional behavior of NiTi-related shape memory alloys
AU - Hinte, Christian
AU - Barienti, Khemais
AU - Steinbrücker, Jan
AU - Hartmann, Jana Mercedes
AU - Gerstein, Gregory
AU - Herbst, Sebastian
AU - Piorunek, David
AU - Frenzel, Jan
AU - Fantin, Andrea
AU - Maier, Hans Jürgen
N1 - Funding information: This study was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) within Grants #388671975 and 313773923. The authors also thank G. S. Firstov for discussions on the topic.
PY - 2020/6
Y1 - 2020/6
N2 - The introduction of high-entropy alloys (HEA) into the field of shape memory alloys offers enormous potential for improving their functional properties. It is shown how a successive increase in chemical complexity results in strictly monotonically enlarged and increasingly distorted lattices. With increasing the number of elements added to the alloy, the effect of solid solution strengthening appears to be curtailed and first insights into the contribution of additional mechanisms based on lattice distortions are possible. The alloys developed in this study, reaching from ternary NiTiHf to senary TiZrHfCoNiCu, show a great potential to exploit interatomic interactions regarding improvement of functional fatigue. Despite the absence of stress plateaus related to detwinning, recovery effects at loads above 1000 MPa and significant strain recoveries are shown.
AB - The introduction of high-entropy alloys (HEA) into the field of shape memory alloys offers enormous potential for improving their functional properties. It is shown how a successive increase in chemical complexity results in strictly monotonically enlarged and increasingly distorted lattices. With increasing the number of elements added to the alloy, the effect of solid solution strengthening appears to be curtailed and first insights into the contribution of additional mechanisms based on lattice distortions are possible. The alloys developed in this study, reaching from ternary NiTiHf to senary TiZrHfCoNiCu, show a great potential to exploit interatomic interactions regarding improvement of functional fatigue. Despite the absence of stress plateaus related to detwinning, recovery effects at loads above 1000 MPa and significant strain recoveries are shown.
KW - Compression tests
KW - Functional degradation
KW - High-entropy alloys (HEA)
KW - Mechanical behavior
KW - NiTi
KW - Shape memory alloys (SMA)
KW - X-ray diffraction (XRD)
UR - http://www.scopus.com/inward/record.url?scp=85085048491&partnerID=8YFLogxK
U2 - 10.1007/s40830-020-00284-0
DO - 10.1007/s40830-020-00284-0
M3 - Article
AN - SCOPUS:85085048491
VL - 6
SP - 181
EP - 190
JO - Shape Memory and Superelasticity
JF - Shape Memory and Superelasticity
SN - 2199-384X
IS - 2
ER -