Production of fine-grained foils by large strain extrusion-machining of textured Ti–6Al–4V. Issue 2 (18th December 2017)

• Record Type: Journal Article
• Authors: Palaniappan, Karthik; Murthy, H.; Rao, Balkrishna C.
• Is Part Of: Journal of materials research. Volume 33:Issue 2(2018)
• Page Start: 108
• Page End: 120
• Publication Date: 2017-12-18
• Subjects: Ti, -- machining, -- texture; Materials -- Research -- Periodicals; 620.1105
• DOI: 10.1557/jmr.2017.445
• Languages: English
• ISSNs: 0884-2914

Abstract

Abstract: Abstract : The large strain extrusion-machining process has been used to refine the microstructure in a Titanium alloy (Ti–6Al–4V). The unconstrained cutting or machining of Ti–6Al–4V entails the formation of shear localized chips at nearly all cutting speeds, thereby hindering the use of extrusion-machining to produce fine-grained materials. The present effort attempts to suppress shear localization by the suitable modification of texture in Ti–6Al–4V through the cold-rolling process prior to extrusion-machining. Ti–6Al–4V plates were cold rolled to 30, 40, 45, and 47% thickness reductions. These textured plates were extrusion machined using a suitably designed fixture leading to fine-grained continuous foils with increased hardness. Microscopy has revealed that the suppression of shear localization in the foils produced from plates which are cold rolled to more than 40% of thickness reduction is triggered by texture formation. For thickness reductions slightly lower than 40% (e.g., 30%), suppression can be achieved only by a combination of texture and extrusion.