PhD Studentship: Understanding Irradiation Stability of Ti(CON) Precipitates in Vanadium Alloys - Birmingham, United Kingdom - University of Birmingham

Description

Supervision and International Collaborations:

You will be based at the University of Birmingham and will be co-supervised by the industrial partner Tokamak Energy Ltd.

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This project will involve multi-national collaborators, and so you will have a unique opportunity to work with renowned industrial experts and with world-recognized institutes such as Oak Ridge National Lab, University of Tennessee, University of Michigan in the US, and University of Paris-Saclay in France.

You will work in a diverse, inclusive, friendly and collaborative environment that nurtures excellence and innovation. You will be given proper mentorship to develop transferable skills so that you have a successful post-PhD career.


Background:
Successful fusion energy demonstration depends upon availability of high-performance materials that can withstand the harsh fusion operating conditions.

These include a simultaneous presence of elevated temperatures, high neutron doses, corrosive liquids and thermo-mechanical stresses including very high magnetic fields.

For fusion first-wall/blanket concepts utilizing liquid lithium, vanadium (V) alloys based on V-Cr-Ti ternary system are regarded worldwide as the leading candidates.

This is because V alloys have excellent compatibility with liquid lithium.

Further, V alloys have other desirable properties such as non-ferromagnetic nature, high thermal conductivity, low thermal expansion coefficient, low activation, and good high-temperature creep strength up to °C.

Advanced V alloy variants derive their high temperature creep strength by titanium oxy-carbonitride (Ti-CON) nanoprecipitation under thermal ageing.

The susceptibility of thermally formed Ti-CON particles to irradiation is currently unknown – which is essential to be quantified to predict V alloy's performance.

Further, Ti-CON phase may also form under irradiation, well below the temperatures needed for thermal ageing.

While Ti-CON produced by thermal ageing is beneficial to high-temperature properties, Ti-CON due to irradiation is deleterious because it is attributed to severe irradiation embrittlement.

A key missing gap is understanding of the mechanisms that control Ti-CON precipitation in V alloys under combined presence of high temperature and fusion-relevant irradiation conditions, which is what this study aims to establish.

The Project:

This study will evaluate the Ti-CON nanoprecipitation phenomenon in V-Cr-Ti alloys using irradiation experiments over a wide range of temperatures and advanced microstructure characterization.

Two specific questions to be studied are:
(i) Understanding the mechanisms of radiation-induced precipitation (RIP) of Ti-CON in V-Cr-Ti alloys.
(ii) Understanding the susceptibility of pre-existing Ti-CON nanoprecipitates in V-Cr-Ti alloys to irradiation-induced degradation, such as ballistic dissolution.
The specific material to be studied is V-4%Cr-4%Ti, a composition previously down-selected by the U.S. Fusion Materials programme.

Who we are looking for:

A first or upper-second-class degree in an appropriate discipline: materials science and engineering, nuclear/chemical/mechanical/aerospace engineering, physics, plasma-physics, condensed-matter physics.

No prior experience is mandatory. Some exposure to microstructural characterisation, fission/fusion basics would be advantageous.

A self-motivated, inquisitive, genuine and driven individual.


Contact:
Please contact Prof. Arunodaya (Arun) Bhattacharya – and/or Dr. Samara M. Levine – to informally discuss your motivation.


Include the following:
CV and transcripts.

PhD co-funded by Tokamak Energy Ltd, via UKAEA's Fusion Skills Voucher Programme.