Microhardness evolution and mechanical characteristics of commercial purity titanium processed by high-pressure torsion

Plastic Deformation of BaTiO3Ceramics by High-pressure Torsion and Changes in Phase Transformations, Optical and Dielectric Properties

“…[21][22][23][24] These results clearly show that, although substantial pressure is required to trigger the cubic-phase formation, the phase transition is facilitated with straining. This finding is consistent with earlier reports concerning the effect of strain on phase transitions in Ti, [38][39][40] Zr, [41] ZrO 2 [30] and some other metallic alloys. [42][43][44] The cubic phase present after HPT processing remains partially stable even after pressure release because of the formation of nanograins.…”

Mechanical properties and microstructural evolution of nanocrystalline titanium at elevated temperatures

“…In addition, it was shown that tensile testing of HPT-processed Ti at 523 K produced very high strength but significantly reduced ductility after 1 turn but there was increased ductility (up to 38%) and slightly increased strength (up to 800 MPa) after 5 turns [28]. The mechanical testing of CP Ti at 673 K showed a maximum elongation to failure of ~130% at a strain rate of 1.0 × 10 -4 s -1 for a specimen processed by HPT through 10 turns [29] and this is consistent with a recent review demonstrating the ability to achieve higher ductilities by conducting SPD processing to very high strains [30].…”

Structural impact on the Hall–Petch relationship in an Al–5Mg alloy processed by high-pressure torsion

“…(1). The gradual evolution to a high level of homogeneity has been reported for numerous materials [15,18,[32][33][34][35][36] although recent results documented an inability to achieve homogeneity in the NiTi shape memory alloy even after processing through 40 turns [37].…”