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. 

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?

• 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.

Methodology:

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.

Primary supervisor: Professor Anish Roy

Entry requirements:

Our entry requirements are listed using standard UK undergraduate degree classifications i.e. first-class honours, upper second-class honours and lower second-class honours. To learn the equivalent for your country, please choose it from the drop-down on our website.

Entry requirements for United Kingdom

Applicants should have or expect to achieve, at least a 2:1 (or equivalent) in any engineering degree programme, physics or mathematics.

English language requirements

Applicants must meet the minimum English language requirements. Further details are available on the International website.

How to apply

All applications should be made online. Under programme name, select ‘Mechanical and Manufacturing Engineering/ Electronic, Electrical and Systems Engineering’. Please quote reference number: UF-AR-2024-2 in your application.

To avoid delays in processing your application, please ensure that you submit your CV and the minimum supporting documents.

The following selection criteria will be used by academic schools to help them make a decision on your application.

Apply now