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, 719-724. (doi:10.4028/www.scientific.net/MSF.667-669.719).

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Description/Abstract

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 μm) 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 μm. 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.

Item Type: Article
ISSNs: 0255-5476 (print)
1422-6375 (electronic)
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TN Mining engineering. Metallurgy
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences > Engineering Materials & Surface Engineering
ePrint ID: 170225
Date Deposited: 04 Jan 2011 12:49
Last Modified: 27 Mar 2014 19:20
URI: http://eprints.soton.ac.uk/id/eprint/170225

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