Abstract
Our newly developed V90Cr5Al5 hydrogen permeable alloy has been extended to enhance malleability by Cu alloying. The resulting (V90Cr5Al5)90Cu10 consists of bcc-(V) and fcc-(Cu) phases and can be cold rolled into a thin membrane with a thickness of 0.1 mm due to the introduction of the ductile copper phase. After rolling and annealing, (V90Cr5Al5)90Cu10 contains finer grains and a higher percentage of special grain boundaries compared to the as-cast case. The rolled/annealed (V90Cr5Al5)90Cu10 exhibits a lower hydrogen diffusivity than the as-cast one, but a significantly improved hydrogen permeation flux due to the reduced membrane thickness and the inverse relationship of flux and thickness. Typically, a pronounced high hydrogen flux of ∼72 cc H2 cm−2min−1 was achieved at a hydrogen pressure difference of 0.6 MPa at 673 K. In comparison with V90Cr5Al5, Cu alloyed membranes exhibit enhanced resistance against hydrogen embrittlement and enhanced long-term hydrogen permeation stability at 673 K.
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