Hydrogen diffusion and interpretation of the 200 K anelastic relaxation in NiTi alloys

Mazzolai, F. M.; Coluzzi, B.; Mazzolai, G.; Biscarini, A.
October 2004
Applied Physics Letters;10/4/2004, Vol. 85 Issue 14, p2756
Academic Journal
The internal friction, the Young’s modulus, and the heat flow have been measured as a function of temperature (20–360 K) at kilohertz frequencies in a H-free and H-doped Ni50.8Ti49.2 alloy, solubilized under vacuum and rapidly furnace cooled. The chemical H-diffusion coefficient DC has been deduced from absorption experiments (323–1063 K) and has been compared with the Einstein diffusion coefficient DE derived from a Snoek (or Zener)-type relaxation PH. The comparison has allowed the interpretation of the so-called 200 K relaxation as a Snoek (or Zener)-type relaxation due to hydrogen.


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