The microstructure and mechanical properties of refractory high-entropy alloys with high plasticity

Yiwen Chen; Yunkai Li; Xingwang Cheng; Chao Wu; Bo Cheng; Ziqi Xu

doi:10.3390/ma11020208

The microstructure and mechanical properties of refractory high-entropy alloys with high plasticity

Yiwen Chen, Yunkai Li^*, Xingwang Cheng, Chao Wu, Bo Cheng, Ziqi Xu

^*Corresponding author for this work

School of Material Science and Engineering

Beijing Institute of Technology

Research output: Contribution to journal › Article › peer-review

60 Citations (Scopus)

Abstract

Refractory high-entropy alloys (RHEAs) are promising materials used at high temperature, but their low plasticity restricts their application. Based on the valence electron concentration (VEC) principle, four kinds of RHEAs (ZrTiHfV0.5Nb_0.5, Zr_2.0TiHfVNb_2.0, ZrTiHfNb_0.5Mo_0.5, and ZrTiHfNb_0.5Ta_0.5) are designed (VEC < 4.5). The experimental results show that the plasticity of these alloys was greatly improved: the static compressive strain was higher than 50% at room temperature (RT), and some elongations were produced in the tensile process. Moreover, the microstructure and phase composition are discussed in detail. The addition of Nb, Mo, and Ta contributed to the high-temperature strength. Finally, the dynamic mechanical properties of these RHEAs with coordination between strength and plasticity are investigated.

Original language	English
Article number	208
Journal	Materials
Volume	11
Issue number	2
DOIs	https://doi.org/10.3390/ma11020208
Publication status	Published - 29 Jan 2018

Keywords

Alloys design
Microstructure and mechanical properties
RHEAs

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10.3390/ma11020208

Cite this

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title = "The microstructure and mechanical properties of refractory high-entropy alloys with high plasticity",

abstract = "Refractory high-entropy alloys (RHEAs) are promising materials used at high temperature, but their low plasticity restricts their application. Based on the valence electron concentration (VEC) principle, four kinds of RHEAs (ZrTiHfV0.5Nb0.5, Zr2.0TiHfVNb2.0, ZrTiHfNb0.5Mo0.5, and ZrTiHfNb0.5Ta0.5) are designed (VEC < 4.5). The experimental results show that the plasticity of these alloys was greatly improved: the static compressive strain was higher than 50% at room temperature (RT), and some elongations were produced in the tensile process. Moreover, the microstructure and phase composition are discussed in detail. The addition of Nb, Mo, and Ta contributed to the high-temperature strength. Finally, the dynamic mechanical properties of these RHEAs with coordination between strength and plasticity are investigated.",

keywords = "Alloys design, Microstructure and mechanical properties, RHEAs",

author = "Yiwen Chen and Yunkai Li and Xingwang Cheng and Chao Wu and Bo Cheng and Ziqi Xu",

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month = jan,

day = "29",

doi = "10.3390/ma11020208",

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volume = "11",

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T1 - The microstructure and mechanical properties of refractory high-entropy alloys with high plasticity

AU - Chen, Yiwen

AU - Li, Yunkai

AU - Cheng, Xingwang

AU - Wu, Chao

AU - Cheng, Bo

AU - Xu, Ziqi

PY - 2018/1/29

Y1 - 2018/1/29

N2 - Refractory high-entropy alloys (RHEAs) are promising materials used at high temperature, but their low plasticity restricts their application. Based on the valence electron concentration (VEC) principle, four kinds of RHEAs (ZrTiHfV0.5Nb0.5, Zr2.0TiHfVNb2.0, ZrTiHfNb0.5Mo0.5, and ZrTiHfNb0.5Ta0.5) are designed (VEC < 4.5). The experimental results show that the plasticity of these alloys was greatly improved: the static compressive strain was higher than 50% at room temperature (RT), and some elongations were produced in the tensile process. Moreover, the microstructure and phase composition are discussed in detail. The addition of Nb, Mo, and Ta contributed to the high-temperature strength. Finally, the dynamic mechanical properties of these RHEAs with coordination between strength and plasticity are investigated.

AB - Refractory high-entropy alloys (RHEAs) are promising materials used at high temperature, but their low plasticity restricts their application. Based on the valence electron concentration (VEC) principle, four kinds of RHEAs (ZrTiHfV0.5Nb0.5, Zr2.0TiHfVNb2.0, ZrTiHfNb0.5Mo0.5, and ZrTiHfNb0.5Ta0.5) are designed (VEC < 4.5). The experimental results show that the plasticity of these alloys was greatly improved: the static compressive strain was higher than 50% at room temperature (RT), and some elongations were produced in the tensile process. Moreover, the microstructure and phase composition are discussed in detail. The addition of Nb, Mo, and Ta contributed to the high-temperature strength. Finally, the dynamic mechanical properties of these RHEAs with coordination between strength and plasticity are investigated.

KW - Alloys design

KW - Microstructure and mechanical properties

KW - RHEAs

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DO - 10.3390/ma11020208

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SN - 1996-1944

VL - 11

JO - Materials

JF - Materials

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ER -

The microstructure and mechanical properties of refractory high-entropy alloys with high plasticity

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Keywords

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