Enhancement of Damping Capbility of MnCu Alloy by High Magnetic Field

The directionally solidified MnCuNiFe alloy was prepared under high magnetic field. microstructure, composition distribution, phase transformation behavior and damping capacity of the were studied by means metallographic microscope, scanning electron transmission X-ray diffraction, differential calorimetry, thermal expansion analysis dynamic mechanical analysis. It is revealed that field has definite effect on refinement dendrite microstructure as well enrichment Ni element, thus induces occurrence martensitic at about 300 K. preferred (111) orientation modulated field, especially induced fct1 → fcc transformation, together with twin boundary relaxation, ensure owns high-damping in a wide-temperature range from 200 K to 320