|About this Abstract
||1st World Congress on High Entropy Alloys (HEA 2019)
||High Entropy Alloys 2019
||P21: Overcoming Mechanostability and Thermal Shielding Trade off via Concatenated Dendritic High Entropy Alloy Foam
||Kook Noh Yoon, Khurram Yaqoob, Je In Lee, Jinyeon Kim, Su Hyeon Kim, DongEung Kim, Eun Soo Park
|On-Site Speaker (Planned)
||Kook Noh Yoon
Thermal shield materials (TSMs) have been designed for saving energy by insulation or protecting human being from extreme environments. For these purposes, the TSMs should be much stronger and insulative. Although metals exhibit high strength and excellent ductility, they by themselves have not been considered as an appropriate candidate for TSMs due to their high thermal conductivity (κ). Therefore, to utilize metallic materials on TSMs, it has been processed into porous structure. Understandably, the pores can effectively hinder the heat transfer through materials; however, they degrade the mechanical property inevitably. In the present study, we first report concatenated dendritic HEA foam which is fabricated by dealloying process in phase separating FeCoCrNi-Cu HEAs. The HEA foams exhibit ultra-low κ, while maintaining the mechanostability of HEAs. Therefore, HEA foam can overcome the trade-off dilemma of conventional metal foams, which might open the door of new era of thermal protection utilizing metals.