Flattening aluminum annular specimens subjected to channel angular pressing.

The paper deals with the results of flattening tests of aluminum annular specimens subjected to deformation processing by a new method of channel angular pressing (CAP) of annular metal billets developed on the basis of inventions patented in the Russian Federation. Aluminum annular billets (99.4% Al) of 13.9 mm diameter, 1.9 mm wall thickness, and 8 mm height were subjected to CAP at room temperature with a device of D / d ≅ 1.14 outlet and inlet channels diameter ratio. The annular billets were loaded with a tubular punch by a hydraulic press. Load curves for flattening of aluminum annular specimens (99.4% Al) are given. The authors demonstrate the mechanical properties under flattening (radial compression) of aluminum annular specimens in the initial state and after CAP. Mechanical radial compression tests of aluminum annular specimens (99.4% Al) of 16 mm diameter, 1.35 mm wall thickness and 4.15 mm height were made with Instron-1195 testing machine at constant loading speed of ≍0.83 × 10⁻⁵ ms⁻¹. An increase in the yield point of aluminum (99.4 % Al) resulted from CAP at room temperature has been found. [ABSTRACT FROM AUTHOR]