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Pattern-forming nanoprecipitates in NiTi-related high entropy shape memory alloys.

Authors :
Hinte, Christian
Barienti, Khemais
Steinbrücker, Jan
Gerstein, Gregory
Swider, Mark Alan
Herbst, Sebastian
Eggeler, Gunther
Maier, Hans Jürgen
Source :
Scripta Materialia. Sep2020, Vol. 186, p132-135. 4p.
Publication Year :
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. Image, graphical abstract [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
13596462
Volume :
186
Database :
Academic Search Index
Journal :
Scripta Materialia
Publication Type :
Academic Journal
Accession number :
143879096
Full Text :
https://doi.org/10.1016/j.scriptamat.2020.05.007