Daniel Celis Garza

team member photo
Research Student

Email: 
daniel.celisgarza@hmc.ox.ac.uk

The plastic deformation of materials is generally governed by the
generation and motion of dislocations through the crystal lattice.
Microstructural features such as grain boundaries, precipitates and
inclusions impede the dislocation motion causing strengthening but often
limiting ductility. Dislocations often accumulate in the vicinity of
these microstructural features and their mutual interactions and
reactions lead to further increased hardening and local hot spots in
stress that can lead to failure initiation. Understanding the behaviour
of the dislocation ensemble is complex due to the many body interactions
that take place.

This project will continue development of discrete dislocation
plasticity simulations with the particular aim of extending present
capabilities from simple single phase, single crystal models to more
complex geometries incorporating the grain boundaries and precipitates
that are more representative of real engineering alloys. Coupled
diffusion models allowing development of the microstructure concurrent
with plastic deformation will also be considered.

These models and simulations are of particular interest in fusion
energy because not only do they offer mechanistic insight into the
damage sustained by tokamak reactor walls, but can prove useful in
designing better-suited materials for all aspects of fusion energy
production.