Manjunath, G.K.Preetham Kumar, G.V.P.Udaya Bhat, K.Huilgol, P.2026-02-052018Journal of Materials Engineering and Performance, 2018, 27, 11, pp. 5644-565510599495https://doi.org/10.1007/s11665-018-3691-1https://idr.nitk.ac.in/handle/123456789/24944In the present work, cast Al-5Zn-2Mg alloy was processed through equal-channel angular pressing (ECAP) in route B<inf>C</inf> up to four number of passes. Microstructure and mechanical properties were investigated on processed and unprocessed materials. In cast condition, the material was composed of dendritic structure. After homogenization treatment, large-sized grains were observed. After ECAP processing, significant grain refinement was observed. After ECAP processing, high-density dislocations and high degree of misorientation between the grains were observed. In cast material, rod-shaped precipitates were observed, while, after ECAP processing, spherical-shaped precipitates were observed. ECAP processing leads to a noticeable improvement in the mechanical properties of the material. After four passes, 122% improvement in the microhardness and 135% improvement in the ultimate tensile strength of the material were observed. After three passes, a slight decrease in the mechanical properties was observed. This is attributed to the dissolution of the metastable ?? phase, annihilation of dislocations, dynamic recrystallization and texturing during ECAP processing. Brittle fracture mode was observed in tensile testing cast and homogenized samples. After ECAP processing, fracture mode was changed into shear fracture mode. © 2018, ASM International.Aluminum alloysDynamic recrystallizationFractureFracture testingGrain refinementGrain size and shapeMagnesium alloysMechanical propertiesMicrostructurePressing (forming)Tensile strengthTensile testingTernary alloysX ray diffraction analysisX ray powder diffractionZinc alloysAl-Zn-Mg alloyDendritic structuresECAPHomogenization treatmentLarge sized grainsMicrostructure and mechanical propertiesRod-shaped precipitatesUltimate tensile strengthEqual channel angular pressing