アルミニウムの冷間高速押出し材の組織について

抄録

The behaviours of extrusion by the high-energy-rate metal forming machine, Dynapak Model 600 (ram velocity: 13 m/s) were investigated, and compared with those by the 500 t hydraulic press of slow extrusion speed (about 0.6 mm/s).
The results obtained are as follows:
(1) The hardness distribution along the rod extruded by Dynapak changes remarkably from the front to the back end, and sometimes partial recrystallization occurs.
(2) Softening due to heat-treatment begins at a lower temperature in the rods extruded by Dynapak than in those by the hydraulic press.
(3) The texture differences are scarcely observable between the inner and the outer zones of the rod extruded by Dynapak, in which, however, the ⟨100⟩ component of the double texture of ⟨111⟩+⟨100⟩ is slightly stronger, compared with that of the slow speed extrusion.