Micro-mechanical deformation behavior of CoCrFeMnNi high-entropy alloy

Lu, Kaiju; Chauhan, Ankur; Litvinov, D.; Tirunilai, Aditya Srinivasan; Freudenberger, J.; Kauffmann, Alexander; Heilmaier, Martin; Aktaa, Jarir

doi:10.1016/j.jmst.2021.04.079

Cited by 19 publications

(1 citation statement)

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“…High entropy alloys (HEAs) have been developed as a new concept of the metallic material designed by Yeh et al [1], which refer to the alloys containing complex compositions of multi-principal element constituents. Since then, numerous alloys with unique properties have been discovered and investigated [2][3][4][5][6][7][8][9][10]. For example, the FeCoNiCrMn HEA displays enhanced mechanical properties of tensile strength over 1280 MPa and fracture toughness value exceeding 200 MPa m 1/2 at cryogenic temperature [11]; He et al [2] reported that the (CoNi) 50 (TiZrHf) 50 HEA shows an extraordinary Elinvar effect between room temperature and 900 K, along with an superelastic limit of ~ 2%; and W-bearing HEAs exhibit an outstanding radiation resistance [6].…”

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confidence: 99%

High Tensile Strength and Superelasticity of Directionally Solidified Ti30Ni30Fe10Hf10Nb20 Eutectic High Entropy Alloy

Zeng

Zhou

et al. 2022

Acta Metall. Sin. (Engl. Lett.)

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Superelasticity has been widely used in various fields. High elastic limit simultaneously with large superelasticity is urgent in the critical applications. In this study, we have employed the high entropy alloy (HEA) concept to develop a new TiHfNiFe-Nb eutectic HEA (EHEA) based on the TiNi-Nb eutectic alloy. The results show the directional catkin-like microstructure with the fiber eutectic in the center and the lamella eutectic in the outside form along the directional solidification direction when the growth rate is 60 mm/h. The corresponding specimens display the high strength of 1409 MPa and superelasticity of 3.1% in tension at room temperature, which is attributed to the synergetic effect of high entropy, preferred orientation, ordered body-centered cubic (B2) phase and disordered body-centered cubic phase in the eutectic structure. This work sheds light on designing the high-performance superelastic function materials with EHEAs.

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