Texture, hardening and mechanical anisotropy in AA 8090-T851 plate

An evaluation is made of the effect of preferred crystallographic orientati ons on the dislocations locking mechanisms underlying the macroscopic yield strength of a 8090-T851 Al-Li alloy plate. The interplay between dislocati ons-related strengthening mechanisms and textures is made via the Taylor fa ctor for the critical resolved shear stress for slip. By this way, each mic rostructural contribution to the strengthening (precipitates, solid solutio n, grain boundaries), independently determined from textures, is projected into a specific direction, with reference to the rolling direction, by mult iplying it for the Taylor factor. This one is computed by means of the popL a software package, analysing experimental texture data obtained by X-ray d iffraction. The prediction of the strength anisotropy in the 8090-T851 text ured alloys is then carried out. Finally, the normal plastic anisotropy of the alloy is investigated experimentally and by means of polycrystal plasti city calculations, pointing out its dependence on the crystallographic text ures. (C) 1998 Elsevier Science S.A. All rights reserved.