Contribution of Twins to the Strengthening of Commercial Purity Titanium after Equal-Channel Angular Pressing
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 um) 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 um. 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 ℃ with a grain size of 200-300 nm, and is close to -790 MPa, the yield strength of commercial Ti-6A1-4V alloys.
Yue Zhang Saleh N.Alhajeri Roberto B.Figueiredo Nong Gao Jing Tao Wang Terence G.Langdon
Department of Materials Science and Engineering,Nanjing University of Science and Technology,Nanjing Materials Research Group,School of Engineering Sciences,University of Southampton,Southampton SO17 1 Materials Research Group,School of Engineering Sciences,University of Southampton,Southampton SO17 1
国际会议
5th International Conference on Nanomaterials by Severe Plastic Deformation(第五届剧烈塑性变形纳米材料国际会议)
南京
英文
719-724
2011-03-01（万方平台首次上网日期，不代表论文的发表时间）