Improving the thermomechanical and magnetic properties of CuMnAI Heusler alloy by TiB doping

摘要

The influence of simultaneous doping of Ti and B on the thermomechanical, structural, and magnetic properties of CuAIMn Heusler alloys was evaluated in this study. The samples were prepared via induction casting, and they were characterized by X-ray diffraction, differential thermal analysis, optical microscopy, scanning electron microscopy, mechanical microhardness tests, and magnetometry. The alloys presented the austenite phase with L2_1 + DO_3 structures. It was found that the doping of TiB reduced the average grain size and increased the amount of second-phase precipitates, which was attributed to the low Ti solubility in the austenitic matrix. A reduction in the values of Curie temperature, melting temperature, melting enthalpy, and HV microhardness was observed with the doping of TiB to the CuAIMn ternary system. It was also verified that the simultaneous doping of Ti and B changed the magnetic behavior of the CuAIMn system from paramagnetic (with weak ferromagnetic contribution) to ferromagnetic order. Our results bring to light a new alternative to doping CuAIMn alloy, and improve the structural and magnetic properties, interesting parameters for technological applications.