Microstructure and Mechanical Properties of CrMoVNbFex High-entropy Alloys

doi:10.11901/1005.3093.2015.460

Chinese Journal of Materials Research

2016, Vol. 30

Issue (8): 609-613 DOI: 10.11901/1005.3093.2015.460

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Microstructure and Mechanical Properties of CrMoVNbFe_x High-entropy Alloys

WANG Jiang, HUANG Weigang^*

College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China

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WANG Jiang, HUANG Weigang. Microstructure and Mechanical Properties of CrMoVNbFe_x High-entropy Alloys. Chinese Journal of Materials Research, 2016, 30(8): 609-613.

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Abstract

The effect of Fe content on the phase constituent, microstructure and mechanical properties of CrMoVNbFe_x high-entropy alloys were investigated by using of XRD, SEM, EDS and microhardness tester. The results reveal that CrMoVNbFe_x alloys exhibited as a solid solution of single bccphase without Fe, whereas bcc solid solution+ intermetallic σ phase was observed with the increase of Fe content. The as-cast alloys show a microstructure with typical casting dendrites. It was found that Mo mainly exist in the dendrite, Fe and Cr concentrated mainly in the interdendriticspace and the Nb content in the interdendriticspace was slightly higher than that in the dendrite. With the increasing Fe content, the microstructure of alloys is refined and the hardness is enhanced significantly and the maximum hardness value of the CrMoVNbFe_x high-entropy alloys reaches HV950.

Key words: metallic materials high-entropy alloy phase structure microstructure mechanical property

Received: 17 August 2015

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https://www.cjmr.org/EN/10.11901/1005.3093.2015.460 OR https://www.cjmr.org/EN/Y2016/V30/I8/609

Fig.1 X-ray diffraction spectra of CrMoNbVFe_x high-entropy alloys

Table 1 The calculated parameters△S_mix、δ、△H_mix and VEC of CrMoVNbFe_x alloys

Table 2 The values of

Δ H AB mix

(kJ/mol) calculated by Miedema's model for atomic pairs between elements involved in this paper

Fig.2 SEM backscattered electron images of the as-cast CrMoVNbFe_x high-entropy alloys (a) x=0; (b) x=0.2; (c) x=0.4; (d) x=0.6; (e) x=0.8; (f) x=1.0

Table 3 Compositions of different microstructure areas in as-cast CrMoVNbFe_x (x=0, 0.2, 0.4, 0.6, 0.8, 1) high-entropy alloys

Fig.3 Microhardness of CrMoVNbFe_x high-entropy alloys at different Fe contents

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