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

doi:10.1007/s40195-022-01434-2

Abstract

Abstract:

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.

Key words: High-entropy alloy, Eutectic alloy, Directional solidification, Superelasticity, Tensile strength

Huan Li, Shuai Zeng, Yong-Kang Zhou, Hai-Long Li, Hong-Wei Zhang, Hai-Feng Zhang, Zheng-Wang Zhu. High Tensile Strength and Superelasticity of Directionally Solidified Ti₃₀Ni₃₀Fe₁₀Hf₁₀Nb₂₀ Eutectic High Entropy Alloy[J]. Acta Metallurgica Sinica (English Letters), 2022, 35(10): 1583-1590.

Figures/Tables 6

Fig. 1 Microstructure of Ti30Ni30Fe10Hf10Nb20 HEAs prepared by TC and DS at growth rates of 1-180 mm/h: a XRD patterns, b cross-section SEM images of TC samples inset with high magnification image, c-e and g, h cross-section SEM images of DS samples at a growth rate of 60 mm/h at different magnifications, f longitudinal-section SEM image of the 60 mm/h DS samples, and i TEM EDS-mapping of the 60 mm/h DS samples

Fig. 2 a-c Longitudinal-section and d-f cross-section SEM images of the DS Ti30Ni30Fe10Hf10Nb20 samples at growth rates of 1 mm/h, 60 mm/h and 180 mm/h, respectively

Fig. 3 Engineering tensile stress-strain curves of the Ti30Ni30Fe10Hf10Nb20 HEAs prepared by TC and DS at growth rates of 1 mm/h, 60 mm/h and 180 mm/h

Table 1 Elastic strain and elastic limit in room-temperature tensile

Alloys	Elastic strain (%)	Elastic limit (MPa)
TC	0.6	708
1 mm/h	0.8	767
60 mm/h	3.1	1409
180 mm/h	1.2	881

Fig. 4 EBSD images, before deformation, of the Ti30Ni30Fe10Hf10Nb20 HEAs prepared by TC and DS at growth rates of 1-180 mm/h: a-c phase images of the 1 mm/h, 60 mm/h and 180 mm/h DS samples respectively, d-f inverse pole figures of the 1 mm/h, 60 mm/h and 180 mm/h DS samples respectively, g-i KAM maps of the 1 mm/h, 60 mm/h and 180 mm/h DS samples respectively

Fig. 5 EBSD images, after deformation, of the Ti30Ni30Fe10Hf10Nb20 HEAs prepared by TC and DS at growth rates of 1-180 mm/h: a-c phase images of the 1 mm/h, 60 mm/h and 180 mm/h DS samples respectively, d-f KAM maps of the 1 mm/h, 60 mm/h and 180 mm/h DS samples, respectively

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

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