7th International Conference on Nanomaterials by Severe Plastic Deformation | |
Effect of severe cold-rolling and annealing on microstructure and mechanical properties of AlCoCrFeNi2.1 eutectic high entropy alloy | |
Wani, I.S.^1 ; Bhattacharjee, T.^2,5 ; Sheikh, S.^3 ; Lu, Y.^4 ; Chatterjee, S.^1 ; Guo, S.^3 ; Bhattacharjee, P.P.^1 ; Tsuji, N.^2,5 | |
Department of Materials Science and Metallurgical Engineering, IIT Hyderabad, India^1 | |
Department of Materials Science and Engineering, Kyoto University, Japan^2 | |
Materials and Manufacturing Technology, Chalmers University of Technology, Gothenburg | |
SE-41296, Sweden^3 | |
Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Dalian | |
116024, China^4 | |
Elements Strategy Initiative for Structural Materials (ESISM), Kyoto University, Japan^5 | |
关键词: Duplex microstructures; High entropy alloys; Microstructural refinement; Microstructure and mechanical properties; Nano-crystalline structures; Ordered structures; Severe cold rolling; Strength ductility balance; | |
Others : https://iopscience.iop.org/article/10.1088/1757-899X/194/1/012018/pdf DOI : 10.1088/1757-899X/194/1/012018 |
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来源: IOP | |
【 摘 要 】
The possibility of microstructural refinement and improvement of mechanical properties by severe cold-rolling was investigated in an AlCoCrFeNi2.1lamellar eutectic high entropy alloy (EHEA). The as-cast alloy revealed fine scale eutectic mixture of L12(ordered FCC) and B2 (ordered BCC) phases. During severe cold-rolling up to 90% reduction in thickness the B2 phase maintained the ordered structure, while the L12phase showed the evolution of a nanocrystalline structure and progressive disordering. Annealing of the severely cold-rolled material resulted in the formation of duplex microstructures composed of two different phases with equiaxed morphologies and significant resistance to grain growth up to 1200°C. Annealing at 1000°C resulted in an optimum strength-ductility balance with the tensile strength of 1175 MPa and the total elongation of 23%. The present results showed that severe cold-rolling and annealing can impart very attractive mechanical properties in complex EHEAs.
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