Tension–compression asymmetry of 〈c+a〉 slip in Ti–6Al. (15th March 2020)

• Record Type: Journal Article
• Authors: Roberts, William; Gong, Jicheng; Wilkinson, Angus J.; Tarleton, Edmund
• Is Part Of: Scripta materialia. Number 178(2020)
• Page Start: 119
• Page End: 123
• Publication Date: 2020-03-15
• Subjects: 〈c+a〉 slip -- Ti–6Al -- Tension compression asymmetry -- Crystal plasticity -- CRSS; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.11.002
• Languages: English
• ISSNs: 1359-6462

Abstract

Graphical abstract: Abstract: Microcantilevers with triangular cross-sections were machined using a focused ion beam from an α Ti–6Al alloy. Plasticity was predominantly in the lower part of the cantilever, allowing tension–compression asymmetry to be investigated by bending the cantilever up or down. Both ⟨ a ⟩ prismatic slip and 〈 c + a 〉 pyramidal slip were investigated. The critical resolved shear stress was determined by calibrating a crystal plasticity model and found to be 329 MPa for ⟨ a ⟩ prismatic slip in both tension and compression. However significant tension–compression asymmetry was observed for 〈 c + a 〉 pyramidal slip; increasing to 820 MPa under compression and decreasing to 558 MPa in tension.