Analysis of the strain-rate sensitivity and the Bauschinger effect in fine-grained Cu and Cu-Ni alloys. (1st July 2017)

• Record Type: Journal Article
• Authors: Shadkam, Ashkan
• Is Part Of: Scripta materialia. Number 135(2017)
• Page Start: 68
• Page End: 71
• Publication Date: 2017-07-01
• Subjects: Fine-grained -- Strain-rate sensitivity -- Bauschinger effect -- Backstress -- Grain size distribution; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2017.03.024
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: The strain-rate sensitivity along the load-unload experiments on fine-grained pure Cu and Cu-Ni alloys are presented. For grain sizes lying in the range of 1–10 μm in pure Cu, Cu16at%Ni and Cu50at%Ni, an elevated rate sensitivity at the first few percent of plastic strain is observed. At this elasto-plastic transition, a substantial hysteresis during unloading is developed corroborating to the Bauschinger effect in the fine-grained materials. The strain rate sensitivity results are analyzed along the load-unload response of the materials. A dislocation-based phenomenological model is developed to describe the experimental observations. Graphical abstract: