LAUSR

Various severe plastic deformation methods have been considered by numerous researchers with the purpose of making fine-grained parts with a high strength-to-weight ratio by applying severe mechanical deformations without changing the chemical composition of the material. The die of equal channel multiangular pressing (ECMAP) process was used here to exert repetitive severe plastic deformation on Al-3%Mg strip-type samples. In this work, the ECMAP die was made considering optimal geometric values that had been obtained in the previous studies by the grey optimization method, and then the microstructural evolution of output parts were studied carefully. Grain size distribution in various channels and channels curvature was extracted. The results showed that the average grain size obtained after the initial annealing operation is 39.48 μm, after passing through the first channel; the value reduces to 19.57 μm, and after passing through the second and third channels, the average grain size decreases to 9.74 and 6.66 μm, respectively.