Abstract
The relationship between the microstructure and hydrogen permeability of Nb–TiFe alloys is investigated. The fully eutectic alloy, which consisted of the bcc-(Nb, Ti) and B2-TiFe phases, is found in the Nb16Ti53Fe31 composition. The alloys formed between the Fe50Ti50 and Nb16Ti53Fe31 compositions, expressed as (Ti50Fe50)1−x(Nb16Ti53Fe31)x, consist of the eutectic structure, including the primary TiFe phase for x<1 or the primary (Nb, Ti) phase for x>1. The volume fraction of the primary phase is decreased (0<x<1) and increased (x>1) with increasing x. The alloys with 0.4<x<0.8 are hydrogen permeable at 673K. The Nb12Ti52Fe36 alloy with 60vol% of the primary FeTi phase exhibits a high hydrogen permeability of 2.9×10−8molH2/m/s/Pa0.5 at 673K without hydrogen embrittlement. The formation of hydrogen permeable Nb–TiFe alloys is possible at higher Ti content and lower Nb content than those of the Nb–TiNi and Nb–TiCo alloys.
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