OFFER Sri Tapaswi Nori

Dr. Sri Tapaswi Nori won the OFFERR project, funded by Euratom, titled, 

Characterization of defects induced by high-temperature irradiation in oxide-dispersion-strengthened medium-entropy alloys

 

Abstract: The demand for high-temperature radiation-resistant structural materials has intensified with the rapid evolution of clean energy technologies such as nuclear power. Recently, novel oxide-dispersion-strengthened medium-entropy alloys (ODS-MEAs) were developed for such applications. The alloys are expected to possess superior mechanical properties and best irradiation damage resistance under high-temperature irradiation. However, these materials are least understood owing to limited literature. Hence, the scope of the current work is to evaluate some of the ODS-MEAs following high-temperature irradiation.  Specifically, the proposed work will understand the defect behavior in ODS-MEAs because it is the origin of major detrimental irradiation effects such as radiation-induced segregation, hardening, and swelling. To achieve this, defects such as dislocation loops and voids will be characterized in ODS-MEAs such as ODS-NiCoFe, ODS-NiCoCr, and ODS-NiCoFeCr after Ni ion irradiation at 580 and 700 degrees C. Additionally, defects in single crystal MEAs such as NiCoFe and NiCoCr and an ODS-steel, 14YWT, will be characterized to facilitate comparison with ODS-MEAs. The Analytical scanning/transmission electron microscope FEI Talos F200X FEG (S)TEM at the VTT Technical Research Centre of Finland will be utilized for imaging the defect structures. TEM lamellae for these studies will be prepared at the visiting team's institution, the National Centre for Nuclear Research, Poland. Various TEM techniques such as the on-zone STEM bright field, rel-rod, kinematic two-beam conditions, and weak-beam dark-field will be used. The findings will help in assessing the irradiation damage resistance of ODS-MEAs and conducting a comparative study to identify the best ODS-MEA for high-temperature irradiation applications.



This project has received funding from the European Union Horizon 2020 research and innovation
programme under grant agreement No 857470 and from European Regional Development Fund
via Foundation for Polish Science International Research Agenda PLUS programme grant
No MAB PLUS/2018/8.
Poland
The project is co-financed from the state budget within the framework of the undertaking of the Minister of Science and Higher Education "Support for the activities of Centers of Excellence established under Horizon 2020".

Grant: 5 143 237,70 EUR
Total value: 29 971 365,00 EUR
Date of signing the funding agreement: December 2023

The purpose of the undertaking is to support entities of the higher education and science system that have received funding from the European Union budget in the competition H2020-WIDESPREAD-2018-2020/WIDESPREAD-01-2018-2019: Teaming Phase 2. in the preparation, implementation and updating of activities, maintenance of material resources necessary for carrying out activities, acquisition and modernization of scientific and research apparatus, maintenance and development of personnel potential necessary for the implementation of activities, and dissemination of the results of scientific activities.