Recycling of titanium alloy swarf directly into wire using the Conform^TM continuous extrusion process

¹ Department of Materials Science and Engineering, University of Sheffield, Sir Robert Hadfield building, Mappin Street, Sheffield, S1 3JD, United Kingdom
² BWE Ltd., Beaver Industrial Estate, Beaver Rd, Ashford TN23 7SH, United Kingdom
³ Airbus S.A.S., 1 Rond-Point Maurice Bellonte, 31707 Blagnac, France

email: sasmythe1@sheffield.ac.uk

Abstract

Conform^TM is an extrusion process, which has been in use since the 1970s. Although it is primarily used with aluminium or copper rod/powder feedstocks, work at the Univ. Sheffield over the last decade has involved the use of titanium feedstocks for various applications. This paper expands on this knowledge by utilising low cost, aerospace titanium alloy swarf, which is the largest waste product from the manufacturing of aerospace titanium components. Swarf is fed into a Conform^TM extrusion machine at room temperature and is fully consolidated into round wire/rod profiles in one, solid-state step, using modified tooling for titanium. Such wire can be used for additive manufacture or welding wire. To date there has been numerous successful trials in this challenging process, including the production of both 10 mm commercially pure titanium rod (from powder) and, more importantly, the production of 5 mm diameter Ti-6Al-4V wire from swarf. The material produced has since been characterised using light and electron microscopy and mechanical properties determined using tensile testing and microhardness indenting.