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Contribution of twins to the strengthening of commercial purity titanium after equal-channel angular pressing

Zhang, Yue, Alhajeri, Saleh N., Figueiredo, Roberto B., Gao, Nong, Wang, Jing Tao and Langdon, Terence G. (2011) Contribution of twins to the strengthening of commercial purity titanium after equal-channel angular pressing [in special issue: Nanomaterials by Severe Plastic Deformation: NanoSPD5] Materials Science Forum, 667-669, pp. 719-724. (doi:10.4028/

Record type: Article


Room temperature equal-channel angular pressing (ECAP) was employed on commercial purity titanium in the present work. Mechanical twining was observed in ~90% grains while the grains were not significantly refined (~10 ?m) after ECAP. TEM observations showed that the twins observed under OM are usually composed of a serial of parallel twin bands with a width of ~1 ?m. Microhardness and tensile tests showed that such a coarse-grained microstructure combined with a high fraction of mechanical twins has a microhardness of ~ 240 Hv, yield strength of ~ 730 MPa, tensile strength of ~ 740 MPa and elongation to failure of ~ 16%. This yield strength is much higher than 620-640 MPa, the yield strength of ultrafine-grained titanium by 8~12 passes of ECAP at 450 oC with a grain size of 200-300 nm, and is close to ~ 790 MPa, the yield strength of commercial Ti-6Al-4V alloys.

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e-pub ahead of print date: December 2010
Published date: 2011
Venue - Dates: conference; 2010-12-01, 2010-12-01
Organisations: Engineering Mats & Surface Engineerg Gp


Local EPrints ID: 170225
ISSN: 1662-9752
PURE UUID: 0401d5ee-1d1c-4316-9a7f-22e010348a80
ORCID for Terence G. Langdon: ORCID iD

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Date deposited: 04 Jan 2011 12:49
Last modified: 18 Jul 2017 12:18

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Author: Yue Zhang
Author: Saleh N. Alhajeri
Author: Roberto B. Figueiredo
Author: Nong Gao
Author: Jing Tao Wang

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