Recently, bulk nano-structured materials produced by severe plastic deformation (SPD) have attracted scientists attention.  Materials produced by SPD are of great importance because of (1) non-porous structure, (2) great mechanical properties such as high strength and toughness and (3) proper dimension for mechanical and physical testing.  Several methods have been introduced for imposing the s...

Metals and alloys fabricated by fusion-based additive manufacturing (AM), or 3D printing, undergo complex dynamics of melting solidification, presenting challenges to the effective control grain structure. Herein, we report on use high-intensity ultrasound that controls process solidification during AM 316L stainless steel. We find favours columnar-to-equiaxed transition, promoting formation fi...

In this paper, cyclic flaring and sinking (CFS) as a new severe plastic deformation (SPD) method was employed to produce the ultrafine grain (UFG) copper tubes. The extra friction has eliminated in the CFS method that provided the possibility for production of longer UFG tubes compared to the other SPD methods. This process was done periodically to apply more strain and consequently finer grain...