Multi-layered gradient structure manufactured by single-roll angular-rolling and ultrasonic nanocrystalline surface modification. (September 2020)

• Record Type: Journal Article
• Authors: Lee, H.H.; Park, H.K.; Jung, J.; Amanov, A.; Kim, H.S.
• Is Part Of: Scripta materialia. Number 186(2020)
• Page Start: 52
• Page End: 56
• Publication Date: 2020-09
• Subjects: Heterostructures -- Copper -- Severe plastic deformation -- Toughness -- Single-roll angular-rolling; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2020.03.051
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: A new type of gradient structure is fabricated by the sequential processing of two advanced severe plastic deformation methods, single-roll angular-rolling and ultrasonic nanocrystalline surface modification, which refine microstructures mainly on the core and surface of a metallic sheet, respectively. This material with a multi-layered grain size gradient in the thickness direction features impressive strength-toughness synergy beyond the initial and reverse gradient-structured materials. The superiority is attributable to hetero-deformation induced mechanisms that originate from microstructural heterogeneity. Ultimately, this work suggests a new processing approach by which a strength-toughness window saturated at a certain level in gradient-structured materials can be extended. Graphical abstract: Image, graphical abstract