Structure and magnetic properties of Sm2Fe17Nx alloys after severe plastic deformation by high pressure torsion

Abstract In this study the structure and magnetic properties of Sm2Fe17Nx alloys after high pressure torsion (HPT) was investigated. As a result of HPT, bulk samples were obtained as disk-shaped 0.5 mm high and 8 mm in diameter. The maximum coercivity Hc = 621.4 kA/m (7.768 kOe) was obtained on the samples after 3 turns (e = 501) with the remanence and σs = 114.5 A·m2/kg. It was shown that HPT leads to decomposition of the Sm2Fe17Nx phase with the formation of α-Fe and the exchange-coupled state. The influence of temperature on the deformation processes of Sm2Fe17Nx alloys was established.