THE HYDROGEN SOLUBILITY AND THERMODYNAMICS OF DISSOLVED HYDROGEN IN TI0.45FE0.45B0.1 ALLOY SYSTEM

The hydrogen solubility and the thermodynamics of dissolved hydrogen i n Ti0.45Fe0.45B0.1 were investigated in the ranges 0 less than or equa l to P/bar less than or equal to 40 and 300 less than or equal to T/K less than or equal to 450 and compared with those in TiFe. The hydroge n intake capacity at any particular temperature and hydrogen equilibri um pressure is larger in the alpha phase of Ti0.45Fe0.45B0.1-H compare d to that in TiFe-H and nearly the same in the beta phase. The plateau pressure in Ti-0.45 Fe0.45B0.1-H at any temperature is slightly highe r than that in TiFe-H. The absolute values of the relative partial mol ar enthalpy and entropy of the dissolved hydrogen in Ti0.45Fe0.45B0.1- H are larger than those in TiFe-H. The exothermicity of hydrogen absor ption decreases with the increase of hydrogen content in the a phase o f Ti0.45Fe0.45B0.1-H and remains more or less constant in the alpha+be ta phase. (C) 1998 International Association for Hydrogen Energy.