Effects of temperature and initial microstructure on the equal channel angular pressing of Ti–6Al–4V alloy

Mechanical and electrical responses of nanostructured Cu–3wt%Ag alloy fabricated by ECAP and cold rolling

“…2, most of the (sub)grains were markedly elongated to the shear direction imposed by ECAP and/or CR, resulting in pronounced lamellar band structures. The deformed structures contained an ill-defined contrast and a high dislocation density inside lamellar bands, which is typical of several metals fabricated through single-pass of ECAP [6,12]. Fig.…”

Low-temperature superplasticity of ultra-fine-grained Ti-6Al-4V processed by equal-channel angular pressing

“…A detailed description of the tooling has been reported previously. [14] In brief, the ECAP die ( Figure 2) was designed to yield an effective strain of ϳ1 during each pass (Table I) ⌽ ϭ 90 C i a W ϭ 40 C a axis between passes; i.e., route C was used. Route C was chosen for two reasons.…”

“…Indeed, Salishchev et al [8,9] recently fabricated the UFG structure by means of multistep isothermal forging. Equal-channel angular pressing (ECAP) has been suggested [4,[10][11][12][13][14][15] as an alternative SPD technique with scaleup potential. Nevertheless, under conventional conditions (hot workpiece/cold tooling/high ram speed), special techniques have been found to be required to avoid the formation of shear bands and shear failures during ECAP.…”

“…Nevertheless, under conventional conditions (hot workpiece/cold tooling/high ram speed), special techniques have been found to be required to avoid the formation of shear bands and shear failures during ECAP. [13,14] Although several previous efforts have been conducted on the processing of UFG Ti-6Al-4V, there has been no systematic study of the grain refinement via ECAP and the resulting superplasticity. Therefore, the purpose of the present research was to develop a fundamental understanding of microstructure evolution and the possible enhancement of superplasticity in the low-temperature regime.…”

Deformation Mechanism of Zr702 Processed by Equal Channel Angular Pressing

“…The UFG microstructures have been obtained in various metal systems based on Al, Cu, Ni, Fe, Mg, and Zr. [11][12][13][14][15][16][17][18][19][20][21][22][23][24] Concerning the effects of the processing parameters on the microstructural evolution, the channel angles of dies and the deformation routes are considered to be important but not fully explored, particularly for the hcp metals. [21,22,25] Regarding the characteristics of the substructure development during heavy deformation such as cold rolling, the Risø group [26][27][28][29][30][31][32][33] proposed the concept of the cell block (CB) structure delineated by nearly parallel geometrically necessary boundaries (GNBs) in which cells were confined by incidental dislocation boundaries (IDBs).…”