UKAEA Papers

"Thermodynamic Assessment of the Quaternary WTaCrV Refractory High Entropy Alloy as a Means to Guide Experimental Approaches"

• Bochuan Sun
• Mark Fedorov
• Jan Wrobel
• Duc Nguyen-Manh
• Caleb Hatler
• Matthew Vigil
• Dan J. Thoma
• Osman El-Atwani
• Enrique Martinez

High-entropy alloys (HEAs) are being explored as potential candidates for radiation-tolerant materials, with some compositions exhibiting good resistance to defect cluster formation. One such system is WTaCrV, although only a single composition has been experimentally tested under ion irradiation, where it showed phase decomposition at low temperat…

"Precipitation of Cr-rich clusters in Fe-Cr alloys: Effects of irradiation from first principles modeling and experimental observations"

• Mark Fedorov
• Jan S. Wróbel
• Andrew J. London
• Krzysztof J. Kurzydłowski
• Chu-Chun Fu
• Tonˇci Tadi´
• Sergei L. Dudarev
• Duc Nguyen-Manh

"Radiation-induced precipitation of chromium in Fe-Cr alloys containing C and N impurities: First-principles modelling and experimental observations"

• Mark Fedorov
• Jan S. Wróbel
• Andrew J. London
• Krzysztof J. Kurzydłowski
• Chu-Chun Fu
• Tonči Tadić
• Sergei L. Dudarev
• Duc Nguyen-Manh

Using exchange Monte Carlo (MC) simulations based on an ab initio-parameterized Cluster Expansion (CE) model, we explore the phase stability of low-Cr Fe-Cr alloys as a function of vacancy (Vac), carbon, and nitrogen interstitial impurity content. To parameterise the CE model, we perform density functional theory calculations for more than 1600 …

"Composition stability of single phase in Cr-Fe–Mn-Ni alloys at high temperature: First-principles prediction and experimental validation"

• Mark Fedorov
• Jan Wrobel
• Witold Chromińskia
• Grzegorz Cieślak
• Magdalena Płocińska
• Krzysztof J. Kurzydłowski
• Duc Nguyen-Manh

"Phase stability and magnetic properties in fcc Fe-Cr-Mn-Ni alloys from first-principles modelling"

• Mark Fedorov
• Jan S. Wrobel
• Antonio Fernandez-Caballero
• Krzysztof J. Kurzydlowski
• Duc Nguyen-Manh

Multi-component alloy Fe-Cr-Mn-Ni is a promising new candidate system not only because of its potential application as structural materials beyond conventional austenitic steels but also for fundamental physics role played by Mn element in Fe-Cr-Ni based alloys. In this work, the phase stability of magnetic face-centered cubic (fcc) Fe-Cr-Mn-Ni sys…

"Configurational Entropy in Multicomponent Alloys: Matrix formulation from ab initio based Hamiltonian and application to FCC Cr-Fe-Mn-Ni system"

• A. Fernandez-Caballero
• M. Fedorov
• J.S. Wrobel
• P.M. Mummery
• D. Nguyen

Configuration entropy is believed to stabilize disordered solid solution phases in multicomponent systems at elevated temperatures over intermetallic compounds by lowering the Gibbs free energy. Traditionally the …