Achieving a saturated tensile strength of face-centered cubic Al2.5Ti2.5(CoCrFeNi)95 high-entropy alloy via severe cold drawing

doi:10.1016/j.jmst.2025.04.042

Abstract

Abstract: Pursuing higher strength is an eternal topic for metallic materials, however, single-phase face-centered cubic (FCC) metallic materials are weak in strength. In this work, Al_2.5Ti_2.5(CoCrFeNi)₉₅ high-entropy alloy (HEA) wires are fabricated with a saturated tensile strength at 2.3 GPa, one of the highest in the field of single-phase FCC metal. The heavily drawn wires possess an ultra-fine heterogeneous microstructure consisting of nanotwin-embedded nanograins and dislocation-decorated long fiber grains. The drawing-induced grain refinement stagnates from the strain around 7 with an average grain size of 33 nm and an aspect ratio of 3.5. Grain boundary motion dominates the dynamic balance of the ultra-fine microstructure feature in the HEA wire during the drawing process. The strengthening mechanism of the wire is also revealed based on microstructural parameters obtained by statistical TEM observation and high-energy synchrotron XRD. The present work provides a basic understanding of the strength limit and its microstructural feature for single-phase FCC HEA.

Key words: High-entropy alloys, Cold drawing, Mechanical properties, Nanotwin

Zheng Tian, Lichu Zhou, Caijuan Shi, Runguang Li, Fei Yang, Yiping Xia, Xiaodan Zhang, Jianqing Jiang, Feng Fang. Achieving a saturated tensile strength of face-centered cubic Al_2.5Ti_2.5(CoCrFeNi)₉₅ high-entropy alloy via severe cold drawing[J]. J. Mater. Sci. Technol., 2026, 244: 173-179.

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Achieving a saturated tensile strength of face-centered cubic Al_2.5Ti_2.5(CoCrFeNi)₉₅ high-entropy alloy via severe cold drawing

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