Shear moduli of a niobium single crystal with hydrogen additions at elevated temperature

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Abstract
The independent elastic constants of a niobium single crystal were measured over the temperature range 298–600 K. Concentrations of 1.90 and 4.69 at.% hydrogen were successively introduced at 573 K through a palladium coating. Elastic shear constants were determined at both concentrations. The data show that C44 increases and C′ decreases with increasing hydrogen concentration, but the slopes of both concentration dependences decrease so that the slope of the concentration dependence of the anisotropy ratio is insensitive to temperature. Both increasing temperature and increasing hydrogen concentration tend to move the anisotropy ratio toward unity.