Details
| Original language | English |
|---|---|
| Pages (from-to) | 132-135 |
| Number of pages | 4 |
| Journal | Scripta materialia |
| Volume | 186 |
| Publication status | Published - 28 May 2020 |
Abstract
The microstructure and the fracture behavior of TiZrHfCoNiCu high entropy shape memory alloys with two different compositions were investigated. An unusual microstructure featuring pattern-forming nanoprecipitates was observed in dendritic and the interdendritic regions of both alloys. The unique higher-level order of these precipitates does not follow concentration gradients but is influenced by homogeneity and mechanical stress. The results also demonstrate that high entropy alloys are not necessarily homogeneous single-phase solid solutions. Moreover, it appears that solid solution strengthening as the primary mechanism also has to be questioned.
Keywords
- Electron backscattering patterns (EBSP), High entropy alloys (HEA), Interfacial segregation, Nanocrystalline microstructure, Shape memory alloys (SMA)
ASJC Scopus subject areas
- Materials Science(all)
- Physics and Astronomy(all)
- Condensed Matter Physics
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
- Materials Science(all)
- Metals and Alloys
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In: Scripta materialia, Vol. 186, 28.05.2020, p. 132-135.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Pattern-forming nanoprecipitates in NiTi-related high entropy shape memory alloys
AU - Hinte, Christian
AU - Barienti, Khemais
AU - Steinbrücker, Jan
AU - Gerstein, Gregory
AU - Swider, Mark Alan
AU - Herbst, Sebastian
AU - Eggeler, Gunther
AU - Maier, Hans Jürgen
N1 - Funding information: Financial support by Deutsche Forschungsgemeinschaft (German Research Foundation) under project nos. 388671975 and 313773923 is gratefully acknowledged. The authors also thank G. S. Firstov for discussions on the topic.
PY - 2020/5/28
Y1 - 2020/5/28
N2 - The microstructure and the fracture behavior of TiZrHfCoNiCu high entropy shape memory alloys with two different compositions were investigated. An unusual microstructure featuring pattern-forming nanoprecipitates was observed in dendritic and the interdendritic regions of both alloys. The unique higher-level order of these precipitates does not follow concentration gradients but is influenced by homogeneity and mechanical stress. The results also demonstrate that high entropy alloys are not necessarily homogeneous single-phase solid solutions. Moreover, it appears that solid solution strengthening as the primary mechanism also has to be questioned.
AB - The microstructure and the fracture behavior of TiZrHfCoNiCu high entropy shape memory alloys with two different compositions were investigated. An unusual microstructure featuring pattern-forming nanoprecipitates was observed in dendritic and the interdendritic regions of both alloys. The unique higher-level order of these precipitates does not follow concentration gradients but is influenced by homogeneity and mechanical stress. The results also demonstrate that high entropy alloys are not necessarily homogeneous single-phase solid solutions. Moreover, it appears that solid solution strengthening as the primary mechanism also has to be questioned.
KW - Electron backscattering patterns (EBSP)
KW - High entropy alloys (HEA)
KW - Interfacial segregation
KW - Nanocrystalline microstructure
KW - Shape memory alloys (SMA)
UR - http://www.scopus.com/inward/record.url?scp=85085512506&partnerID=8YFLogxK
U2 - 10.1016/j.scriptamat.2020.05.007
DO - 10.1016/j.scriptamat.2020.05.007
M3 - Article
AN - SCOPUS:85085512506
VL - 186
SP - 132
EP - 135
JO - Scripta materialia
JF - Scripta materialia
SN - 1359-6462
ER -