The equal-channel angular extrusion technique was applied to a powder metallurgy source Be alloy. Extrusions were successfully completed on Ni-canned billets of Be at approximately 425C. No cracking was observed in the billets, and significant grain refinement was achieved. Microstructural features and dislocation structures were considered here for single-pass extrusion, including evidence of <c> and <c+a> dislocations. Significant crystallographic texture developed during equal-channel angular extrusion, which was discussed in terms of this unique deformation processing technique and the underlying physical processes which sustain the deformation.

Equal-Channel Angular Extrusion of Beryllium. R.D.Field, K.T.Hartwig, C.T.Necker, J.F.Bingert, S.R.Agnew: Metallurgical and Materials Transactions A, 2002, 33[3A], 965-72