Comparison of structural relaxation of Pd_(39)Ni_(10)Cu_(30)P_(21) bulk metallic glass under ambient pressure and at a high pressure

摘要

Structural relaxations of a Pd_(39)Ni_(10)Cu_(30)P_(21) bulk metallic glass (BMG) under ambient pressure and at a high pressure are compared by means of temperature-modulated differential scanning calorimetry (TMDSC) measurements. The structural relaxation is evaluated by the enthalpy recovery involved upon passing through the glass transition in the irreversible TMDSC curves. It is found that the isothermal relaxation of the BMG under ambient pressure leads to a lower-enthalpy state than that under a high pressure. The onset temperature for the enthalpy recovery process is found to exhibit a linear dependence on the recovery enthalpy.