Influence of plastic deformation on the formation and growth of embritteling metal hydrides
Hydrogen embrittlement due to hydride formation is a major problem for zirconium alloys used in constructions, e.g. in the nuclear industry. The goal of the proposed project is to investigate the nucleation, further growth and dissolution of hydrides due to a developing plasticity in the transition zone between hydride and matrix. The results will hopefully contribute to a better understanding of the complex process of hydrogen embrittlement. A method will be developed that combines different numerical methods. The plasticity will be modelled by dislocation dynamics. A diffusion law will be used that includes both hydrogen concentration gradients and hydrostatic stress gradients. An adaptive moving boundary method will be developed to track the growth and eventual dissolution of a hydride. The interaction between dislocations and hydride formation will be studied in detail using reaction force fields calculations. The established method and results will be published as scientific papers in peer-reviewed international journals, and communicated at international scientific conferences, and to Swedish industry.