Development, processing and understanding of high entropy alloys

High entropy alloy is a term applied to a relatively new type of metallic alloy system that comprises near equiatomic concentrations of at least three or more alloying elements. A surprising characteristic of HEAs is that despite their apparent compositional complexity, they comprise usually a complete or near simple solid solution. Since their discovery simultaneously in Oxford and Japan in 2004 a large number of these alloys have been manufactured at small scale and their structure and properties reported in the scientific literature, but some uncertainties remain. Technologically, the alloys are immature - but some data shows intriguing and attractive combinations of properties, such as ultra-high toughness at cryogenic temperatures.

The project will focus on the development, processing and understanding of high entropy alloys (HEAs) manufactured by powder based processes that allows near-net shape components to be fabricated directly. The research will initially investigate composition effects on structure and properties based around the relatively well-known FeNiCrMnCo alloy, processed from powders to bulk using field assisted sintering technique (FAST) and state of the art 3D printing. The property assessment will focus on the less well-understood cryogenic properties and resistance to irradiation that can be studied by laboratory ion radiation experiments with collaborators. Subsequent work will look at new compositions, including light-weight HEAs, and the possibilities of adding minor fractions of potent dispersion strengthening materials.”

This EPSRC-funded 3.5 year DPhil in Materials DTP studentship will provide full fees and maintenance for a student with home fee status (this status includes an EU student who has spent the previous three years (or more) in the UK undertaking undergraduate study). Candidates with EU fee status are eligible for a fees-only award, but normally would have to provide funding for their living costs from another source such as personal funds or a scholarship. The stipend will be at least £16,009 per year. Information on fee status can be found at http://www.ox.ac.uk/admissions/graduate/fees-and-funding/fees-and-other-charges.

Candidates are considered in the January 2020 admissions cycle which has an application deadline of 24 January 2020.

Any questions concerning the project can be addressed to Dr Enzo Liotti (enzo.liotti@materials.ox.ac.uk). General enquiries on how to apply can be made by e mail to graduate.admissions@materials.ox.ac.uk. You must complete the standard Oxford University Application for Graduate Studies. Further information and an electronic copy of the application form can be found at http://www.ox.ac.uk/admissions/postgraduate_courses/apply/index.html.

 

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