The demand for materials that can withstand extreme temperatures poses a significant challenge. New energy technologies, like efficient
turbines and heat exchangers, require strong materials at high temperatures. Similarly, space exploration requires durable materials
at extremely low temperatures. Due to embrittlement at cryogenic temperatures and thermal instability at elevated temperatures,
understanding how materials behave in such conditions is crucial. Conventional metallic materials have limits in strengthening, calling for
alternative materials. Multicomponent high entropy alloys (HEAs) offer opportunities due to their potential for better strength-ductility
combination. HEAs can be used to trigger multiple deformation mechanisms, breaking the strength-ductility trade-off dilemma. The
proposed project focuses on understanding and optimizing refractory and precipitation-strengthened HEAs for applications under extreme
temperatures (15 to 1500 K). These materials are critical for industries such as aerospace, energy, and advanced manufacturing, where
durability and performance at both high and low temperatures are essential. The project aims to understand the underlying deformation
mechanisms of HEAs through advanced in-situ experiments using synchrotron and neutron diffraction, combined with computational
modelling. By integrating experimental findings with crystal plasticity models, the project seeks to design HEAs with superior mechanical
properties, contributing to more sustainable and efficient materials for extreme environments. This research not only advances materials
science but also aligns with sustainability goals by reducing the environmental impact of high-performance materials.