Lightweight Eutectic High Entropy Alloys as Phase Change Material for Thermal Energy Storage Applications.

Monday, September 30, 2024: 11:10 AM
21 (Huntington Convention Center)
Mr. Godson Nyaforkpa , Egypt-Japan University of Science and Technology, Alexandria, Egypt
The pursuit of energy-saving materials has spurred intense research into innovative solutions, with lightweight Eutectic High Entropy Alloys (LwEHEAs) emerging as a focal point due to their potential as Phase Change Materials (PCM) in thermal energy storage applications. This study delves into the comprehensive characterization of these alloys, focusing on their thermo-physical properties, thermal cyclability and conductivity, mechanical and microstructural analysis to ascertain their viability as PCM. The design of the eutectic alloy is rooted in thermodynamic principles, ensuring an optimal balance of constituent elements to meet the requirements of PCM. The primary requisites, including high latent heat of fusion, long-term chemical stability, economic feasibility, minimal volume change, and a desired temperature range, serve as guiding parameters throughout the alloy development process. Mechanical properties are evaluated through Vickers hardness testing and compression tests employing a Universal Testing Machine, providing insights into the structural integrity and durability of the alloys. Microstructural analysis utilizing optical microscopy, X-ray Diffraction (XRD), and Scanning Electron Microscopy (SEM) offers a detailed understanding of the morphology and phase composition of the alloy. The applicability of the alloy as PCM is rigorously assessed using a Differential Scanning Calorimeter (DSC), elucidating its phase change behavior and latent heat capacity. Thermal conductivity is determined using a thermal conductivity analyzer, ensuring optimal performance in thermal energy storage applications. Furthermore, electrochemical and corrosion tests are conducted using an electrochemistry station equipped with a smooth Pt sheet and gravimetric analysis, respectively, to evaluate the electrochemical stability and resistance to corrosion of the alloy. The tailored composition of LwEHEAs will yield exceptional thermo-physical properties, making them up-and-coming candidates for high-temperature metallic phase change materials for thermal energy storage applications. This research advances our understanding of novel materials for sustainable energy solutions, with potential implications for a wide range of thermal energy storage applications.