1. INTRODUCTION The plastic working of metals through the application of severe plastic deformation (SPD) methods has acquired substantial attention over the last decades. This interest arises mainly from the possibility for using SPD processing techniques to introduce a significant amount of plastic strain into bulk polycrystalline materials and thereby to obtain increased mechanical properties including high mechanical strength at room temperature and a superplastic forming capability at elevated temperature. Usually, the grain refinement obtained using SPD techniques is in the sub-micrometre level and ranging from 100 nm to 1.0 μm, but there are also some investigation results showing grain refinement to the nanometer range (<100 nm). Many different SPD processing techniques are now commercially available, but the most promising methods are equal-channel angular pressing (ECAP) and high-pressure torsion (HPT). The processing using HPT method usually results in finer grains than ECAP; nevertheless, ECAP method has gained greater attention to date for two reasons. First, the ECAP processing technique uses uncomplicated tools that are readily available in many laboratories. Second, processing by ECAP produces relatively large samples with ultrafine-grained structure, and the processing technique can be scaled-up easily for the industrial applications. The principle of the ECAP method was discussed in the works [1, 2]. Due to the low-density, Al and its alloys are widely used in different applications such as automotive, aircraft or marine industries. Moreover, fine-grained microstructure increases the mechanical and physical properties which focuses the attention of scientists in the last decades [3÷6]. The Al-Mg aluminium alloys are one of the most studied from the solid solution hardening. These alloys are especially attractive for production of fine-grained materials with high strength through the ECAP method due to Mg[...]
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