Effect of Strain Rate on Tensile Ductility and Fracture Behavior of Bulk Nanotwinned Copper1. Issue 12 (1st April 2015)

• Record Type: Journal Article
• Authors: You, Zesheng; Lu, Lei
• Is Part Of: Advanced engineering materials. Volume 17:Issue 12(2015:Dec.)
• Page Start: 1754
• Page End: 1759
• Publication Date: 2015-04-01
• Subjects: Materials -- Periodicals; 620.11
• DOI: 10.1002/adem.201500073
• Languages: English
• ISSNs: 1438-1656

Abstract

Abstract : A bulk columnar‐grained copper with preferentially oriented nanoscale growth twins is prepared by means of direct‐current electrodeposition. Tensile tests at different strain rates reveal a significant influence of strain rate on the tensile ductility and fracture behavior. The ductility, especially the post‐necking elongation, reduces dramatically at low strain rates, which is associated with evident intergranular fracture. The results suggest that the grain size as well as the grain boundary microstructural evolution exert a strong influence on the intrinsic fracture mode in the nanotwinned structure. Abstract : A bulk preferentially nanotwinned copper is tensioned at different rates, which reveals a significant strain rate effect. The ductility, especially the post‐necking elongation, reduces dramatically at low rates, associated with a transition from ductile dimple to evident intergranular fracture.