Abstract
Microstructure and hydrogen permeation of Nb56-xWxTi23Co21 (x = 0, 5, 10) alloys have been investigated. The alloying effect of W on the hydrogen diffusivity of Nb56-xWxTi23Co21 alloys was discussed from a perspective of the chemical potential of hydrogen under non-dilute condition. All as-cast ingots were consisted of primary bcc-(Nb) and eutectic (bcc-(Nb)+B2-TiCo) structure. The relation between the hydrogen permeation flux J and the PCT factor fPCT is linear, from which the hydrogen diffusion coefficients were evaluated. The substituting Nb by W leads to improved intrinsic hydrogen diffusion coefficient D∗. With increasing W content, the potential barrier for hydrogen atoms hopping between stable interstitial sites gradually decreases. The concentration-dependent diffusion coefficient D increases with increasing hydrogen concentration.
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