Intermittent plastic flow of single crystals: central problems in plasticity: a review. (July 2014)

• Record Type: Journal Article
• Authors: Niewczas, M.
• Is Part Of: Materials science and technology. Volume 30:Number 7(2014:Jul.)
• Page Start: 739
• Page End: 757
• Publication Date: 2014-07
• Subjects: Plastic flow, -- Workhardening, -- Copper single crystals, -- Dislocation substructure, -- Microstructural instabilities, -- Deformation bands, -- Electrical resistivity, -- Dislocation density, -- Constitutive relations, -- Dislocation mean free path, -- Mean slip distance, -- Self-organised criticality; Materials science -- Periodicals; Microstructure -- Periodicals; Metallurgy -- Periodicals; 620.1105
• DOI: 10.1179/1743284713Y.0000000492
• Languages: English
• ISSNs: 0267-0836

Abstract

Abstract : The relationships between microstructure and plastic flow properties of copper single crystals deformed at low temperatures are reviewed based on the analysis of experimental results of mechanical, structural and electrical resistivity characterisation. Electrical resistivity measurements suggest that the flow stress correlates with the average density of defects accumulated in the microstructure. The characteristic microstructural length scale that determines the flow stress corresponds closely to the size of dislocation free channels and/or cells produced during plastic flow. The correspondence between micro- and macroscopic approaches to the plastic flow has been analysed based on the behaviour of dislocation mean free path and mean slip distance and their relationship to the microstructure. Production and annihilation of nanoscale debris and point defects and their role in plastic flow and questions pertinent to the influence of microstructural instabilities on the flow stress, workhardening, storage and annihilation of lattice defects have been discussed.