{HEAD ~ An Nb—Ti—Co alloy} having {TAIL ~ both good hydrogen permeability} and good hydrogen embrittlement resistance comprises one of Fe, Cu or Mn as a fourth element, incorporating from 1 to 14 mol % 
having
{ HEAD ~ An Nb — Ti — Co alloy } having { TAIL ~ both good hydrogen permeability } and good hydrogen embrittlement resistance comprises one of Fe , Cu or Mn as a fourth element , incorporating from 1 to 14 mol %
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