Abstract:
Tubular Channel Angular Pressing (TCAP) is among the upcoming
and highly interesting, severe plastic deformation methods (SPD).
This technique is reported to be appropriate for the deformation of
very large strains in cylindrical tubes. The tube is pressed by a top
die in a space between a mandrel and a die containing three shear
zones while maintaining the same tube thickness and diameters. To
investigate the SPD process in tubular samples, a commercially
available pure aluminium alloy (AA7075) was used to evaluate the
influence of die geometry, coefficient of friction, pressing speed, die
temperature and tube thickness. The average grain size of about
500 nm was attained from 25 μm by extensive grain refinement.
The results of Finite Element (FE) indicated that an effective strain of
3 was achieved by correctly choosing the input parameters. The
thickness and length of the tube processed by TCAP also exhibited
excellent strain homogeneity. The TCAP process can impose large
strains because of having three deformation zones. Depending on
input parameters selection, this SPD method, therefore, has two
major advantages; (i) excellent strain homogeneity and (ii) high
effective strain.
