Abstract
In this work, the influence of mechanical stress on magnetic properties and electric resistance of a Ni-Mn-In alloy was studied. It is shown that compression of Ni-Mn-In polycrystalline specimens brings about a stressinduced martensitic transformation. Optical images recorded in-situ confirmed the formation of a martensitic structure during loading and back-transformation upon unloading. Unloading after deformation of specimens that had experienced compressive strains up to 6% resulted in full recovery of their resistivity and magnetic susceptibility. The sharp increase in the electric resistance caused by the stress-induced transformation opens up new possibilities for Ni-Mn-In alloys to be used as a material for sensors responding to mechanical stress.
Highlights
Investigations in the field of shape memory and superelastic alloys quite often have aimed at developing alloys with improved performance to widen their prospective applications
Functional properties of shape memory alloys were typically associated with the thermoelastic martensitic transformation driven by temperature and mechanical stress application
These materials are called metamagnetic alloys and include Mn-rich Ni-Mn-X (X=In, Sn, Sb) based alloys [24]. Their distinctive feature is that the martensitic transition in these compounds can be shifted toward lower temperatures by 2-11 K in a magnetic field of 1 T [5] due to a strong coupling between the magnetic and crystallographic structure. This provides for an opportunity to use them in actuator applications triggered by a magnetic field and in magnetic refrigeration where the latent heat is absorbed during the magnetically-induced phase transformation
Summary
Investigations in the field of shape memory and superelastic alloys quite often have aimed at developing alloys with improved performance to widen their prospective applications. Functional properties of shape memory alloys were typically associated with the thermoelastic martensitic transformation driven by temperature and mechanical stress application. Most studies mainly focused on the caloric properties but physical effects associated with a change of electric and magnetic properties during stress-induced martensitic transformation can be anticipated in these alloys as well. . IRU KRXUV 7KH FRPSRVLWLRQ RI WKH DOOR\
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