Microstructure and Mechanical Properties of Commercial Purity HIPed and Crushed Aluminum
Ultrafine-grained aluminum microstructures were processed from commercial purity powder by combining hot isostatic pressing (HIP) and dynamic severe plastic deformation (DSPD). After the first step, the bulk consolidated material showed a random texture and homogeneous microstructure of equiaxed grains with an average size of 2µm. The material was then subsequently impacted, using a falling weight at a strain rate of 300s-1. The resulting material showed a microstructure having an average grain size of about 500 nm with a strong gradient of fiber-like crystallographic texture parallel to the impact direction. The mechanical properties of the impacted material were subsequently characterized under compressive tests at room temperature at a strain rate of 10-4s-1. The effect of the change of the deformation path on the mechanical response parallel (DN) and perpendicular (DT) to the impact direction was also investigated. These results are here discussed in relation with microstructure and texture evolution.
Yuri Estrin and Hans Jürgen Maier
Q. H. Bui et al., "Microstructure and Mechanical Properties of Commercial Purity HIPed and Crushed Aluminum", Materials Science Forum, Vols. 584-586, pp. 579-584, 2008