Superior Strength-Ductility Cocrni Medium-Entropy Alloy Wire

作     者：Liu, Jun-Peng Chen, Jin-Xi Liu, Tian-Wei Li, Chen Chen, Yan Dai, Lan-Hong 

作者机构：State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences Beijing100190 China School of Engineering Science University of Chinese Academy of Sciences Beijing101408 China CAS Center for Excellence in Complex System Mechanics Beijing100190 China 

出 版 物：《SSRN》 

年 卷 期：2020年

核心收录：

主　　题：Entropy 

摘      要：High strength-ductility is the prerequisite requirement for the widely used steel wires in engineering applications. Traditional strengthening strategies on these wires are suffocated inevitably by strength-ductility trade-off dilemma. Recent emerging medium-entropy alloys (MEAs) usually exhibits excellent ductility but relatively lower strength. In this paper, a novel CoCrNi MEA wire with superior mechanical properties was successfully fabricated by heavily drawing process. The yield strength, ultimate tensile strength and elongation could reach 1.5 GPa, 1.8 GPa and 37.4% at liquid-nitrogen temperature, respectively. In-depth microstructure characterization indicates this superior strength-ductility derives from the synergy of dislocations, high-density twins and clear FCC-HCP phase transition. © 2020, The Authors. All rights reserved.