Internal friction and shear modulus of Ti 32 Zr 18 Ni 50 hydrogen storage alloy

Abstract

Internal friction and shear modulus measurements were carried out in a Ti₃₂Zr₁₈Ni₅₀ alloy to study the effect of martensitic transformation on hydrogenation properties. The temperatures of martensitic transformation and austenitic transformation weredetermined. The results were compared to those obtained by electrical resistivity and differential scanning calorimetry techniques. The experiments showed two peaks of internal friction, one associated withdislocation relaxations and the other with phase transformations. The microstructurecharacterisation was carried out by scanning electron microscopy. The phase (Ti, Zr)₂Ni was found mainly precipitated in grain boundaries. Some experiments were carried out in specimens with previous plastic strain and another set of samples was tested in a hydrogen atmosphere.With increasing plastic strain, the amplitude of the peak associated with dislocations decreased. Hydrogen addition during the testsled to an increase in the temperature of maximum internal friction.

Keywords

INTERNAL FRICTION INVERTED TORSION PENDULUM HYDROGEN STORAGE DISLOCATIONS HYDROGEN STORAGE ALLOYS

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