A model for the high-temperature embrittlement of metals containing helium
- 1 May 1979
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine A
- Vol. 39 (5) , 563-580
- https://doi.org/10.1080/01418617908239292
Abstract
A model for the high-temperature embrittlement of He-containing metals is presented. The model is based on the formation of small He bubbles within the grains and on the nucleation and growth of grain-boundary cavities under the influence of He and external stress. These processes explain the strengthening of the grains and the simultaneous weakening of the grain boundaries. After a careful analysis of nucleation and growth of grain-boundary cavities, an analytical expression for the time to rupture as a function of stress, He content, temperature and material parameters is derived. This expression is in satisfactory agreement with experimental data for He-implanted stainless steel samples (Sagüés, Schroeder, Kesternich and Ullmaier 1978).Keywords
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