Improving mechanical properties of (Co1.5FeNi)88.5Ti6Al4R1.5 (R = Hf, W, Nb, Ta, Mo, V) multi-component high-entropy alloys via multi-stage strain hardening strengthening

Jijie Yang; Chaojie Liang; Chenglei Wang; Jian Huang; Bing Qiu; Mulin Liang; Weijie Liu; Yingguang Xie; Kexiang Zhang; Shengfeng Zhou

Materials & Design (Oct 2022)

Improving mechanical properties of (Co1.5FeNi)88.5Ti6Al4R1.5 (R = Hf, W, Nb, Ta, Mo, V) multi-component high-entropy alloys via multi-stage strain hardening strengthening

Jijie Yang,
Chaojie Liang,
Chenglei Wang,
Jian Huang,
Bing Qiu,
Mulin Liang,
Weijie Liu,
Yingguang Xie,
Kexiang Zhang,
Shengfeng Zhou

Affiliations

Jijie Yang: School of Materials Science and Engineering, and Guangxi Key Laboratory of Information Materials, and Engineering Research Center of Electronic Information Materials and Devices, Ministry of Education, Guilin University of Electronic Technology, Guangxi, Guilin 541004, PR China
Chaojie Liang: School of Materials Science and Engineering, and Guangxi Key Laboratory of Information Materials, and Engineering Research Center of Electronic Information Materials and Devices, Ministry of Education, Guilin University of Electronic Technology, Guangxi, Guilin 541004, PR China; School of Materials Science and Engineering, Central South University, Hunan, Changsha 410083, PR China
Chenglei Wang: School of Materials Science and Engineering, and Guangxi Key Laboratory of Information Materials, and Engineering Research Center of Electronic Information Materials and Devices, Ministry of Education, Guilin University of Electronic Technology, Guangxi, Guilin 541004, PR China; Corresponding authors.
Jian Huang: The 34th Research Institute of China Electronics Technology Group Corporation, Guangxi, Guilin 541004, PR China; Corresponding authors.
Bing Qiu: School of Materials Science and Engineering, and Guangxi Key Laboratory of Information Materials, and Engineering Research Center of Electronic Information Materials and Devices, Ministry of Education, Guilin University of Electronic Technology, Guangxi, Guilin 541004, PR China; Corresponding authors.
Mulin Liang: School of Materials Science and Engineering, and Guangxi Key Laboratory of Information Materials, and Engineering Research Center of Electronic Information Materials and Devices, Ministry of Education, Guilin University of Electronic Technology, Guangxi, Guilin 541004, PR China
Weijie Liu: School of Materials Science and Engineering, and Guangxi Key Laboratory of Information Materials, and Engineering Research Center of Electronic Information Materials and Devices, Ministry of Education, Guilin University of Electronic Technology, Guangxi, Guilin 541004, PR China
Yingguang Xie: School of Materials Science and Engineering, and Guangxi Key Laboratory of Information Materials, and Engineering Research Center of Electronic Information Materials and Devices, Ministry of Education, Guilin University of Electronic Technology, Guangxi, Guilin 541004, PR China
Kexiang Zhang: School of Materials Science and Engineering, and Guangxi Key Laboratory of Information Materials, and Engineering Research Center of Electronic Information Materials and Devices, Ministry of Education, Guilin University of Electronic Technology, Guangxi, Guilin 541004, PR China
Shengfeng Zhou: Institute of advanced wear & corrosion resistance and functional materials, Jinan University, Guangdong, Guangzhou 510632, PR China

Journal volume & issue: Vol. 222
p. 111061

Abstract

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In this study, (Co1.5FeNi)88.5Ti6Al4R1.5 (R = Hf, W, Nb, Ta, Mo, V) high entropy alloys were fabricated by vacuum arc melting, followed by cold rolling and aging treatment. The effects of refractory elements on the phase structure, microstructure and mechanical properties of high entropy alloys (HEAs) were systematically studied by means of XRD, SEM and TEM. The results show that the phase composition of all alloys is the face-centered-cubic (FCC) + L12 dual-phase structure, and the addition of refractory elements has not changed the phase structure of the alloys. The tensile results show that the yield strength and elongation of the matrix HEA are 750 MPa and 18 %, respectively. The strength of HEAs is improved variously by adding refractory elements. The HEAs with Ta element have the best comprehensive mechanical properties, exhibit excellent strength-ductility combination, with the yield strength and elongation of 950 MPa and 20 %, respectively, and the fracture mechanism changes from complete ductile fracture to mixed brittle-ductile fracture mode. In addition, the HEAs have multi-stage strain-hardening behavior, which has higher strength when the strain-hardening curve has larger fluctuations, which indicates that the HEAs can improve the strength-plasticity matching relationship by a multi-stage strain hardening behavior.

Published in Materials & Design

ISSN: 0264-1275 (Print); 1873-4197 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.journals.elsevier.com/materials-and-design

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