Superior strength-ductility CoCrNi medium-entropy alloy wire. (May 2020)

• Record Type: Journal Article
• Authors: Liu, Jun-Peng; Chen, Jin-Xi; Liu, Tian-Wei; Li, Chen; Chen, Yan; Dai, Lan-Hong
• Is Part Of: Scripta materialia. Number 181(2020)
• Page Start: 19
• Page End: 24
• Publication Date: 2020-05
• Subjects: Metallic wire -- Mechanical properties -- Twinning -- Phase transformation; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2020.02.002
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: 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. Graphical abstract: Image, graphical abstract