|About this Abstract
||3rd World Congress on High Entropy Alloys (HEA 2023)
||Effects of Si and B Contents on the Microstructure and Mechanical Properties of Boron Enhanced Complex Concentrated Silicides
||Willian Martins Pasini, Adelajda Polkowska, Rafał Nowak, Wojciech Polkowski
|On-Site Speaker (Planned)
||Willian Martins Pasini
Designing and developing new high-temperature structural materials surpassing Ni superalloys limitations is a significant challenge in materials science. Boron Enhanced Complex Concentrated Silicides (BECCSs) – a novel concept of high entropy-derived ultra-high temperature materials combines the concepts of RM-Si-B silicides, RCCAs, and ultra-high-temperature borides building a bridge between lightweight, oxidation-resistant but brittle silicides and high-strength, refractory metallic alloys. A Central Composite Design (CCD) were employed to explore the effect of Si and B additions on BECCSs microstructure, mechanical response and performance. Nine different compositions (NbMo0.9W0.2Ta0.4Ti1.8)1-x-ySixBy, have been manufactured by arc-melting, while their SEM/EDS/EBSD, micro-indentation methods, were used to evaluate the microstructure and mechanical properties at room temperature. The results allow for the identification of specific phase constituents, and it has also been demonstrated that switching from BCC solid solutions to intermetallic-based alloys results in a significant increase in hardness.
||Planned: Metallurgical and Materials Transactions