Local stress gradients in Ti/Al composite wires determined by two-dimensional X-ray microdiffraction

By means of a two-dimensional X-ray microdiffraction system, the stress state of a severely deformed ultrafine-grained Ti/Al composite wire was investigated in terms of the local stress development with the increasing degree of deformation. The wire was processed by Accumulative Swaging and Bundling in order to gain a high-strength composite material, potentially suitable for light-weight applications. In the present paper, the non-conventional measurement system based on the two-dimensional X-ray diffraction and its application is elucidated. Particularly, the results of the local residual stress development concerning different degrees of deformation are shown and discussed with respect to (i) the development of texture, microstructural and mechanical properties of the severely deformed ultrafine-grained material composite as well as (ii) the intrinsic characteristics of the Accumulative Swaging and Bundling process.