Synergy of tensile strength-ductility in IN718/CoCrFeMnNi/IN718 multi-material processed by powder high-pressure torsion and annealing. (1st March 2023)

• Record Type: Journal Article
• Authors: Gu, Gang Hee; Heo, Yoon-Uk; Kwon, Hyeonseok; Ahn, Soung Yeoul; Son, Sujung; Asghari-Rad, Peyman; Kim, Hyoung Seop
• Is Part Of: Scripta materialia. Number 225(2023)
• Publication Date: 2023-03-01
• Subjects: Multi-materials -- Powder metallurgy -- Cold-consolidation -- Mechanical properties -- High-entropy alloy; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2022.115167
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Materials manufactured through conventional powder metallurgy (PM) techniques generally exhibit inferior tensile properties due to structural defects. Nevertheless, a recently proposed cold-consolidation technique using powder high-pressure torsion represents well-manufactured structures with ultra-high tensile properties in the absence of cracks or pores. This novel PM-based technique is utilized in the present investigation to fabricate a multi-material Inconel 718/CoCrFeMnNi/Inconel 718 layered structure. By a combination of uttermost high densification, ultra-fine-grained microstructure, and hetero-deformation induced strengthening effect, the present cold-consolidated multi-material exhibits tensile properties with yield strength of 1255.4 MPa, uniform elongation of 13.7%, and total elongation of 25.0%, overcoming monolithic Inconel 718 and CoCrFeMnNi systems. These findings shed light on the capability of the cold-consolidation technique to manufacture multi-layered and gradient multi-functional structures with excellent mechanical response under tensile stress. Graphical abstract: Image, graphical abstract