High strength Ti of substantial interstitial contents produced by back pressure equal channel angular consolidation of dehydrided particles
W Xu, X Wu, D Sadedin, G Wellwood, K Xia, Y Estrin (ed.), HJ Maier (ed.)
NANOMATERIALS BY SEVERE PLASTIC DEFORMATION IV, PTS 1 AND 2 | TRANS TECH PUBLICATIONS LTD | Published : 2008
Back pressure equal channel angular (BP-ECA) processing was utilised to consolidate a dehydrided (DH) Ti powder of high interstitial content (1.15 wt.% O, 0.09 wt.% N) at 630°C into fully dense bulk ultrafine-grained (UFG) Ti. The consolidated samples showed an increase in the contents of oxygen (1.34 wt.%) and nitrogen (0.3 wt.%). The measured densities of 4.53 g/cm3 for the consolidated samples after 1 and 3 passes were very close to the theoretical value of pure Ti. TEM revealed the formation of a bimodal microstructure in the one-pass sample, comprising equiaxed grains of several micrometers in size with ultrafine grains of the order of 100 nm uniformly distributed at the triple grain ju..View full abstract
The authors greatly appreciate the financial support by the Australian Research Council with the ARC Centre of Excellence for Design in Light Metals and the kind help from Dr. C. Wen and Dr. Y. Li at Deakin University for compressive testing.