Systematic measurement of thermal diffusivity of Pd_(40)Cu_(40-x)Ni_xP_(20) (x = 0,10,40) alloys in liquid, glassy, crystallized, and supercooled liquid states by the laser flash method

摘要

The availability of the thermal diffusivity values, α, of alloy liquids and their glassy states is very limited at the present time, although the thermal diffusivity values of alloy liquids might have a close relationship with their glass-forming ability. Thus, the purpose of this work is to determine the thermal diffusivity values of three particular alloys, Pd_(40)Cu_(30)Ni_(10)P_(20), Pd_(40)Ni_(40)P_(20), and Pd_(40)Cu_(40)P_(20), in the liquid state, systematically obtained using a laser flash method involving a novel sample cell. In the liquid state, the thermal diffusivity value of the Pd_(40)Cu_(30)Ni_(10)P_(20) alloy showing an outstandingly high glass-forming ability is lower than that of the Pd_(40)Ni_(40)P_(20) alloy and it is much lower than that of the Pd_(40)Cu_(40)P_(20) alloy which has a low glass-forming ability. With respect to the thermal diffusivity values of the Pd_(40)Cu_(30)Ni_(10)P_(20) alloy, a positive temperature dependence was certainly obtained in all conditions: The glassy, supercooled liquid, and liquid states.