Modeling and in-situ neutron imaging of hydrogen embrittlement by novel protocol using deuterium -- ISOTOPE

The proposed project (ISOTOPE) targets the well documented, but still poorly understood, issue of embrittlement of metals due to the presence of hydrogen (H) in the lattice.

By combining solid mechanics continuum modeling with transport models from materials science and a novel neutron transmission imaging protocol we aim to gain both direct and indirect evidence of the mechanisms behind this phenomenon. The proposed experimental protocol will significantly improve the ability to detect H in steel.

We will systematically develop the experimental techniques to fully exploit the potential of neutron imaging on length scales relevant for subsequent input to continuum models.

In particular, the method will bridge an existing knowledge-gap by extending spatial H mapping towards the meso- and macroscale, in environments relevant to operational conditions for modern high-strength engineering alloys.The main thrust is the development of an experimental protocol combining tensile and fracture mechanics testing with in-situ neutron imaging.

This includes the design of a novel sample environment that allows for H charging during mechanical testing and at the same time prevents H diffusion during in-situ neutron imaging.

The latter will be attained by utilizing the different attenuation characteristics for neutrons of the two H-isotopes: hydrogen and deuterium.To accomplish this, we bring together a multidisciplinary team of researchers. The main field, however, is solid mechanics.