Title: Hydrogen property in lattice associated with the embrittlement of Co3Ti alloys
Abstract: Some observations relating to solubility, diffusion and trap site of hydrogen were performed on Co3Ti alloys in association with their embrittlement. Hydrogen diffusivity at room temperature was evaluated to be low, similar to that of pure Ni. The desorption curve of hydrogen reached the maximum at ~430 K and the corresponding activation energy was estimated to be 48 kJ mol−1. The fracture energy of the hydrogen-precharged Co3Ti alloys measured by a small punch (SP) test was dependent on the hydrogen content and the alloy stoichiometry; it decreases with increasing hydrogen content and Ti content. It is suggested that the environmental embrittlement of the Co3Ti alloy requires the hydrogen transport mode not via lattice diffusion. Also, the difference in the environmental embrittlement between the two tested alloy compositions is primarily due to the difference in the critical hydrogen content causing grain boundary fracture (i.e. intrinsic grain boundary cohesion).
Publication Year: 1997
Publication Date: 1997-01-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 1
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