Stress-induced resistivity changes in a Ni-Mn-In alloy

摘要

The elastoresistive effect is reported in polycrystalline Ni_(45.4)Mn_(40)In_(14.6) metamagnetic alloy at uniaxial compression: abrupt growth of electric resistance by more than 30% occurs when the applied mechanical stress achieves 16MPa. In the process of deformation at temperature 23 K above martensitic transition, the alloy demonstrated superelastic behavior. Surface morphology of specimen at different strain levels was monitored in situ by optical microscopy. The observations showed that after compressive deformation up to 5% followed by unloading specimen fully reverted back to parent phase.