Fe-36%Niインバー合金中の水素による内部摩擦ピークとその同位体効果

抄録

Internal friction was measured from 150 K to 370 K in transverse vibration for Fe-36%Ni invar alloy charged with hydrogen and deuterium. A hydrogen peak of internal friction was found around 250 K at about 700 Hz and its activation energy was 43 kJ/mol, closely related to that for hydrogen diffusion. This internal friction peak seemed to be of the same origin as the hydrogen peak found previously in austenitic stainless steels. A deuterium peak of internal friction was also detected but located at a temperature 2-3 K higher than the hydrogen peak. Such an isotope shift of the peak temperature 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 hydrogen diffusion in Fe-36%Ni invar alloy, as has been proposed for austenitic stainless steels.