Loughborough University
Microstructure and Texture Development during Solid Consolidation Recycling of Ti-6Al-4V - revised 0926 YYT.pdf (1.8 MB)

Microstructure and texture development during solid consolidation recycling of Ti-6Al-4V

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journal contribution
posted on 2018-11-29, 11:41 authored by Qi (Alex) Shi, Yau TseYau Tse, Rebecca HigginsonRebecca Higginson
Ti-6Al-4V machining chips were recycled using equal channel angular pressing (ECAP). The microstructural and texture evolution of the recycled Ti-6Al-4V have been investigated using scanning electron microscopy, electron backscattered diffraction and transmission electron microscopy. For samples consolidated at 500 °C with a back-pressure of 100 MPa, the as-pressed density reached up to 99.9% after 8 passes. Pronounced grain refinement was also observed with increasing number of passes. The morphology of the grains has been changed from elongated and coarse to equiaxed and ultrafine as the number of passes increases. Strong textures were also introduced during multiple passes via Bc route. Texture has been developed with basal planes parallel to the inclination direction which is at 21° of the extrusion direction. After 4 and 8 passes, basal planes were rotated towards the transverse direction. No oxide can be detected at the chip-chip boundaries when the Ti-Al-4 V machining chips was consolidated at 500 °C. When the sample was processed at 550 °C, significant grain growth and clear oxide layers at the chip-chip interface were observed. In addition, the c-axis were rotated towards the longitudinal direction due to the non-basal slip activity. TEM observation revealed the dislocations presence in the 550 °C ECAP-processed sample.


The authors would like to acknowledge Loughborough University to fund this project via pilot project funding.



  • Aeronautical, Automotive, Chemical and Materials Engineering


  • Materials

Published in

Materials Characterization




223 - 232


SHI, Q., TSE, Y.Y. and HIGGINSON, R.L., 2018. Microstructure and texture development during solid consolidation recycling of Ti-6Al-4V. Materials Characterization, 147, pp.223-232.


© Elsevier


  • AM (Accepted Manuscript)

Publisher statement

This paper was accepted for publication in the journal Materials Characterization and the definitive published version is available at https://doi.org/10.1016/j.matchar.2018.10.020.

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