Diffusion of Hydrogen in the Ni30Ti50Cu20 Shape Memory Alloy

Abstract:

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The chemical diffusion coefficient (Dc) of hydrogen in the Ni30Ti50Cu20 shape memory alloy has been determined in the temperature range 700 - 1150 K by investigating the kinetics of H2 absorption. The mobility of H has also been deduced between 250 K and 280 K from a Snoek-type internal friction peak. The values of the Einstein diffusion coefficient (DE) derived from the relaxation time of this peak were in keeping with those of Dc obtained at low H contents (nH = H/Me < 0.01 ). The combined Arrhenius plot of DE and Dc gave the following values for the diffusion parameters: W = 0.52 ± 0.02 eV, D0 = (5±2)x10-4 cm2/s.

Info:

Periodical:

Solid State Phenomena (Volume 115)

Edited by:

B.M. Darinskii and L.B. Magalas

Pages:

51-56

DOI:

10.4028/www.scientific.net/SSP.115.51

Citation:

G. Mazzolai et al., "Diffusion of Hydrogen in the Ni30Ti50Cu20 Shape Memory Alloy", Solid State Phenomena, Vol. 115, pp. 51-56, 2006

Online since:

August 2006

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Price:

$35.00

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