A Multiscale Investigation of Dislocation-Grain Boundary Interactions in next generation alloys

The goal of this project is to develop a multiscale framework that incorporates continuum dislocation mechanics (CDM) with grain boundary mechanics to understand the interplay between dislocations and grain boundaries (GBs) in metallic alloys. Learn more at A Multiscale Investigation of Dislocation-Grain Boundary Interactions in next generation alloys from the Loughborough University.

Why do this?

• Current models often portray grain boundaries (GBs) as static, impenetrable obstacles for dislocations. This limited understanding hinders the prediction of material behaviour under stress.

• This research will provide a more nuanced view of the dynamic interplay between dislocations and GBs. By capturing how dislocations overcome or are pinned by GBs, we can gain valuable insights into how these interactions influence a material’s strength and ductility.

• The multiscale approach will bridge the gap between the macroscopic response of the material and the microscopic mechanisms governing dislocation-GB interactions, leading to a more holistic understanding of material behaviour.

What are the outcomes of the  A Multiscale Investigation of Dislocation-Grain Boundary Interactions in next generation alloys A Multiscale Investigation of Dislocation-Grain Boundary Interactions in next generation alloys programme offered by Loughborough University Loughborough University ?

• Design of novel alloys with tailored GBs to optimize strength, ductility, and fracture toughness.

• Understanding the role of GB engineering in enhancing material performance for extreme environments.

• Predicting the influence of processing techniques on dislocation-GB interactions and subsequent mechanical properties.

Curriculum:

• We will work on an existing continuum dislocation mechanics model known as Mesoscopic Field Dislocation Mechanics, developed over the years and shown to account for the effect of dislocations across length scales. 

• The model will be extended to incorporate the effect of grain boundaries in a physically reasonable way and will be calibrated with experimental studies to ensure the effects of GBs are accurately accounted for in the model across length scales.