Alihosseini, H., Asle Zaeem, M., & Dehghani, K. (Jan 2012). A Cyclic Forward-backward Extrusion Process as a Novel Severe Plastic Deformation for Production of Ultrafine Grains Materials. Materials Letters, 68, 204-208. [Abstract][Document Site]
A new severe plastic deformation (SPD) process based on a cyclic forward-backward extrusion (CFBE) is introduced for producing ultrafine grains in bulk alloys. CFBE was applied to AA1050 aluminum alloy and produced ultra-high plastic strains without any geometrical change. After only one cycle of CFBE, transmission electron microscopy (TEM) showed a significant grain refinement from 47 μm to about 1 μm. Also a substantial increase in the hardness, from 25 Hv to 47–52 Hv, was recorded by microhardness tests after one cycle of CFBE.