The comparison of thermal and electrical properties of NiMnSn SMA, and effects of thermal aging on alloy

Abstract

The goal of this research is to observe alterations in the structure of the alloy after studying physical parameters such as thermal and electrical properties of the shape memory alloy, which has an atomic percentage of composition of Ni₅₀Mn₃₉Sn₁₁. NiMnSn alloy ingots made by arc melting were heat treated at 900 ^oC for 17 hours in a high purity argon environment, and then alloy cooled in brine-ice water and air. The alloy has been divided into little pieces since it is employed in a variety of physical measurements. DSC measurements on alloy samples were used to estimate phase transformation temperatures, and activation energies were computed based on these data. Electrical measurement results supported the obtained results. Metallographic methods were investigated, and the peak spots from the X-ray diffraction pattern were calculated, allowing the alloy's crystal structure to be determined. This study also looked at the aging effect, which increases the mechanical and functional properties of Ni-based alloy groups.