Tribological Studies of NiMnIn and NiMnSn Magnetic Shape Memory Alloys

Abstract

Ni-Mn-based metamagnetic shape memory alloys (MSMAs) have excellent properties such as magnetic shape memory effect, giant magnetocaloric and barocaloric effects, magneto resistance, and exchange bias effects. These properties introduce them as potential novel materials for technological applications. Therefore, understanding and controlling the wear behavior of NiMn-based MSMAs is an important consideration for mechanical properties. In terms of technological applications, detailed tribological studies clarify the robustness in the harsh environment. In this study, we have performed the tribological behaviors of NiMnX (X = In and Sn) MSMAs. Additionally, the specified alloys are fabricated by two different methods to measure the effects of the fabrication method. The results showed that the wear testing and track depths are affected by fabrication methods, the contribution of X element, and wearing methods. The effect of the load is less significant for reciprocal sliding unlike to pin-on disk. For the pin-on disk, 5 N load presents a clear decrease by means of friction coefficient. Through the experiments, temperature changes from 24.3 to 48.6 degrees C. Microstructural evaluations highlighted that the alloys fabricated by induction furnace have lower width of wear track. Lastly, the NiMnSn alloy fabricated by using the arc melter comparatively has the widest wear track, 1303 mu m. Graphic abstract