Zhang, Yue, Alhajeri, Saleh N., Figueiredo, Roberto B., Gao, Nong, Wang, Jing Tao and Langdon, Terence G.
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, . (doi:10.4028/www.scientific.net/MSF.667-669.719).
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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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