Abstract
Substitution of Nb by the subgroup VI elements W and Mo was performed for dual phase Nb-Ti-Ni alloys containing a large fraction of primary bcc-(Nb) phase, particularly Nb45Ti27.5Ni27.5 and Nb56Ti23Ni21. The alloying effect on the hydrogen permeation performance as a function of the W/Mo concentration was analyzed based on a description considering the chemical potential of hydrogen. The substitution of Nb by W or Mo leads to a reduced hydrogen solubility, which contributes to enhanced resistance to hydrogen embrittlement. Effect of W/Mo alloying on the mobility of H atom and thus the hydrogen permeability is dependent on the W/Mo concentration and the operative temperature. Simultaneous improved hydrogen mobility and mechanical stability of the membrane, especially at lower temperature T ≤ 523 K, was achieved after W/Mo alloying by 5 at%. Specifically, Nb40W5Ti27.5Ni27.5 and Nb46W5Mo5Ti23Ni21 membranes exhibit robust properties during hydrogen permeation cycle between 423 and 673 K.
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