Abstract
High Speed High Pressure Torsion (HS-HPT) refers to processing that involves a combination of high pressure with torsional straining. This technique allows the efficient grain refinement on shape memory alloy brittle (CuAlNi) or with very low plasticity (FeMnSiCr). HS-HPT involve slippage between anvils and sample this means the SPD occurs at specific temperature. The recrystallization during HS-HPT on shape memory alloys determines their functionality without supplemental heat treatments. The samples manufactured by HS-HPT are discs, rings or coned shaped, 20-40mm in diameter and 1mm - 0.2mm thickness. Varying HS-HPT parameters coned shaped elements with increasing deformation degree were produced from Fe28Mn6Si7Cr [mass %] shape memory alloy. Scanning electron microscopy (SEM) observations, highlighted ultrafine structure. Experiments show that the mechanical properties of the alloy can be enhanced by HS-HPT.
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