Microstructural Features and Mechanical Properties of the Ti-6Al-4V ELI Alloy Processed by Severe Plastic Deformation

Abstract

This paper investigates microstructures and mechanical properties of the TI-6AL-4V ELI alloy processed by ECAP and extrusion with various morphology of α and β-phase. Preliminary thermal treatment consisted of quenching and further high-temperature ageing. The present work reveals that the decrease of volume fraction of α-phase globular component in the initial billet results in a more homogeneous structure refinement during SPD, lower internal stress, enhancement of microstructure stability and mechanical properties. An ultimate strength of UTS ≥1350 MPa was obtained in the Ti-6Al-4V ELI alloy while maintaining a ductility of δ≥11%.

Microstructural characterization of Ti-6Al-7Nb alloy after severe plastic deformation

“…Thermomechanical processing used to formation of UFG structure of the Ti-6Al-7Nb alloy (schematic). After Semenova et al 9 .…”

“…Specimens were submitted to thermomechanical treatment according procedure showing in Figure 1, carried out by Professor Ruslan Z. Valiev and his group 9 . Solubilization followed by water quenching and overageing was carried out before thermomechanical processing.…”

Fatigue properties of a dental implant produced by electron beam melting ® (EBM)

“…Therefore, the value of TFL could be used to recognize the transition from a strain-dominated fracture to a stress-dominated fracture (Roessle and Fatemi, 2000). Ilieş et al (2008) reported the TFL in the range of 350-385 cycles for Ti-6Al-4 V. The substitution of the material properties reported in literature (Baumel and Seeger, 1990;Semenova et al, 2006;Flanagan et al, 2008;Wierszycki et al, 2006;Wang and Liu, 2013) into Eq. (1) resulted in the calculated values of N t with less than 400 cycles.…”

Grain Boundaries and Mechanical Properties of Ultrafine-Grained Metals

“…The rods 250 mm in length were subjected to processing in two stages: ECAP in a die set with channel intersection angle u = 120 deg at a temperature of 600°C via B c route and multicycle extrusion at 300°C with total elongation ratio k = 4.2. [14] 1. Microhardness Figure 5 illustrates the dependence of microhardness of the alloy subjected to combined SPD processing on the annealing temperature for 1 hour.…”