The frequency dependence of internal friction caused by hydrogen and deuterium in iron-nickel Invar alloy

Journal Article · Wed Feb 01 04:00:00 EST 1989 · Scr. Metall.; (United States)

DOI:https://doi.org/10.1016/0036-9748(89)90410-9· OSTI ID:6110129

Nishino, Y; Tamaoka, S; Asano, S

A hydrogen peak of internal friction has been investigated in detail for various kinds of fcc Fe-Ni alloys, including such engineering materials as Permalloy and Invar alloy. Its activation energy is closely related to that for hydrogen diffusion. For an Fe-36%Ni Invar alloy, a deuterium peak has also been found, located at a temperature 2 - 3 K higher than the hydrogen peak which appears around 250 K at audio frequencies. Such an isotope shift of the peak position can be interpreted in terms of the isotope effect of hydrogen diffusion. This suggests that the hydrogen peak is attributed to a Snoek-type relaxation caused by dissolved hydrogen in the fcc lattice. In all the above studies, internal friction has been measured by the free-decay method in resonant vibrations and obtained as a function of temperature at nearly constant frequencies. This conventional method, providing the data on the temperature dependence of internal friction, is known to introduce a very low background and suppress a scatter of the data points. However, for fcc Fe-Ni alloys which occlude only a small quantity of hydrogen, the hydrogen peak can only be detected under large supersaturations of hydrogen.

• Research Organization: Nagoya Institute of Technology, Showa-ku, Nagoya (JP)
• OSTI ID: 6110129
• Journal Information: Scr. Metall.; (United States), Journal Name: Scr. Metall.; (United States) Vol. 23:2; ISSN SCRMB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
CHEMICAL COMPOSITION
DEUTERIUM
DIFFUSION
ELEMENTS
ENGINEERING
HYDROGEN
HYDROGEN ISOTOPES
INVAR
IRON ALLOYS
IRON BASE ALLOYS
ISOTOPES
LATTICE PARAMETERS
LIGHT NUCLEI
NICKEL ALLOYS
NONMETALS
NUCLEI
ODD-ODD NUCLEI
PERMALLOY
PHASE TRANSFORMATIONS
STABLE ISOTOPES
TEMPERATURE DEPENDENCE