The Effect of Mn Content on Thermal and Magnetic Properties of Mn50-xNi41+xSn9 (x = 0, 2, 4) Magnetic Shape Memory Alloys

In magnetic shape memory alloys (MSMA), martensitic transformation temperatures and magnetic properties are strongly correlated with the composition of compounds. High Mn concentration in NiMn based MSMA has important effects on martensitic transformation temperatures and magnetization values. In this study, it was reported that the effect of Mn content on thermal and magnetic properties of Mn50-xNi41+xSn9 (x = 0, 2, 4) MSMA. Considered alloys were prepared by an induction melting/casting method, and they were heat treated at 900 oC for 72 hours in argon atmosphere and then quenched into water. Prepared materials’ martensitic transformation temperatures and temperature-dependent magnetization measurements were done by differential scanning calorimetry (DSC) and vibrating sample magnetometer (VSM). As a result, it was determined that Mn content changed the martensitic transformation temperatures and magnetization values of alloys by DSC measurements and thermomagnetization (M-T) curves. Depending on the amount of Mn, it was seen that increment of martensitic transformation temperatures and sudden jump magnetization at these temperatures. Also, the magnetization values decreased as the Mn content decreased