Thermal diffusivity and thermal conductivity of Ni53.6Mn27.1Ga19.3 shape memory alloy

The temperature dependence of the thermal diffusivity, specific heat and density were determined experimentally, and the thermal conductivity was obtained as a product of these parameters in the temperature range from 300 to 650 K for the polycrystalline shape memory Ni53.6Mn27.1Ga19.3 alloy. The phase transformation martensite → austenite took place at about 450 K. The thermal diffusivity and thermal conductivity of the martensite was about 40% lower than that of the austenite. Thermal diffusivity was measured by the flash method where the time dependence of the temperature rise after irradiation was also determined. The latent heat of the phase transformation substantially lowers the temperature rise after irradiation in the transient temperature range.