On the plastic deformation of a CoCrFeNiW-C alloy at elevated temperatures: Part I. Serrated plastic flow and its latent dynamics. (1st January 2023)

• Record Type: Journal Article
• Authors: Wei, Shaolou; Moriarty, Daniel P.; Xu, Michael; LeBeau, James M.; Tasan, Cemal Cem
• Is Part Of: Acta materialia. Volume 242(2023)
• Publication Date: 2023-01-01
• Subjects: Chaotic dynamics -- Slip intermittency -- Thermal activation -- Superalloys; Materials -- Periodicals; Materials science -- Periodicals; Materials -- Mechanical properties -- Periodicals; Metallurgy -- Periodicals; Chemistry, Inorganic -- Periodicals; 620.112
• DOI: 10.1016/j.actamat.2022.118430
• Languages: English
• ISSNs: 1359-6454

Abstract

Abstract: Multi-component Co-alloys are a class of promising metallic materials for high-temperature applications. The present work primarily focuses on the plastic deformation mechanisms of a CoCrFeNiW-C alloy at 650 °C, with emphases on dislocation slip intermittency and plastic flow features. To this end, by integrating in situ scanning electron microscopy-based tests, statistical analyses, and theoretical calculations, several mechanistic insights are revealed. In this material, the plastic flow is featured by evident serration events with a self-organized critical dynamic feature, where mixed Type A and B serrations operate at a moderate deformation level, followed by the onset of a higher magnitude Type B serration. As temperature increases up to 700 and 750 °C, although more evident Type C serration occurs, the self-organized criticality along with the spatial-temporal power-law scaling relation remains nearly unaffected. Microstructural relevance of the serration mechanisms and the deformation substructural characteristics are also explored in greater depth. Graphical abstract: Image, graphical abstract