Tensile strength prediction of dual-phase Al0.6CoCrFeNi high-entropy alloys

• Published in: International journal of minerals, metallurgy and materials Vol. 27; no. 10; pp. 1341 - 1346
• Main Authors: Zhang, Min, Hou, Jin-xiong, Yang, Hui-jun, Tan, Ya-qin, Wang, Xue-jiao, Shi, Xiao-hui, Guo, Rui-peng, Qiao, Jun-wei
• Format: Journal Article
• Language: English
• Published: Beijing University of Science and Technology Beijing 01.10.2020; Springer Nature B.V; Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China; College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China%College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
• Subjects: Alloys; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Cold; Cold rolling; Composites; Corrosion and Coatings; Deformation; Ductility; Entropy; Glass; Grain boundaries; Grain size; High entropy alloys; Homogenization; Materials Science; Mechanical properties; Metallic Materials; Morphology; Natural Materials; Reduction; Strain hardening; Surfaces and Interfaces; Tensile properties; Tensile strength; Thin Films; Tribology; Yield stress; dual-phase high-entropy alloys; strain-hardening exponent; tensile strength; cold rolling
• ISSN: 1674-4799; 1869-103X
• DOI: 10.1007/s12613-020-2084-2

The evolution of the microstructure and tensile properties of dual-phase Al 0.6 CoCrFeNi high-entropy alloys (HEAs) subjected to cold rolling was investigated. The homogenized Al 0.6 CoCrFeNi alloys consisted of face-centered-cubic and body-centered-cubic phases, presenting similar mechanical behavior as the as-cast state. The yield and tensile strengths of the alloys could be dramatically enhanced to ∼1205 MPa and ∼1318 MPa after 50% rolling reduction, respectively. A power-law relationship was discovered between the strain-hardening exponent and rolling reduction. The tensile strengths of this dual-phase HEA with different cold rolling treatments were predicted, mainly based on the Hollomon relationship, by the strain-hardening exponent, and showed good agreement with the experimental results.