Abstract
Cracking in amorphous ribbon of Fe 40 Ni 38 Mo 4 B 18 without external loading could be induced by cathodic charging with hydrogen in 0.1 N H 2 SO 4 + 5 mg/L NaAsO 2 . However, before cracking was initiated, the effect of hydrogen on the mechanical properties could be eliminated if hydrogen had been removed. A series of static charging experiments was carried out to study the cracking characteristics in this alloy. The diffusivity and concentration of hydrogen were obtained from both permeation and cathodic charging /thermal evolution experiments. The cause of cracking by static charging could be attributed to the build up of an internal hydrogen pressure around heterogeneous sites. The critical pressures for crack initiation were calculated based on the diffusivity and concentration data. © 1995 The Minerals, Metals & Material Society.