Determination of Microstructure, Electrical Properties and Microhardness Values of Ni-Mn-Cr-Sn Heusler Alloy

<span style="color: rgb(17, 17, 17); font-family: Poppins; font-size: 14px;">In this study, Ni-Mn-Cr-Sn Heusler [Ni2(Mn1-xCrx)Sn (x=0, 0.25, 0.5, 0.75 and 1, (0≤x≤1)] alloys were investigated. The determined powder samples were compressed under pressure and turned into pellets and then melted in an arc melting furnace to provide the desired Heusler conditions. After XRD analysis was performed on the samples obtained after the process, SEM, EDX and MAPPING images were taken. Phases belonging to each composition were determined by examining the XRD peaks. A backscattered detector was used in SEM, EDX and MAPPING analyses of the samples. Finally, the microhardness measurements of the samples, depending on the composition, were determined using the Vickers hardness test, and the average microhardness values obtained were measured as 486.6-805.5HV0.3. Temperature-dependent electrical measurements of the obtained samples were determined by four-point probe method (FPPT). The electrical resistance values of the samples at 320K were obtained as 0.12-400.72x10-6 (m) and 0.01-0.62 x10-6 (m) at 900 K. In addition, the temperature coefficient of electrical resistivity value (TCR) was calculated as  (1.47-3.16)x (10-3 K-1).</span>