|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||High Entropy Alloys VI
||Phase Stability and Transformation in a Light-weight High-entropy Alloy
||Rui Feng, Michael C. Gao, Chuan Zhang, Wei Guo, Jonathan D. Poplawsky, Fan Zhang, Jeffrey A. Hawk, Joerg C. Neuefeind, Yang Ren, Peter K. Liaw
|On-Site Speaker (Planned)
Developing high-performance light-weight high-entropy alloys (HEAs) can enhance the efficiency and reduce harmful gas emission for wide ranges of applications, and hence is particularly important for defense and transportation industries. Studying their phase stability and transformation helps to tailor the microstructure for optimal material properties, but the complex local atomic environment of HEAs poses challenges to the full understanding. The present study investigates the phase stability and transformation behavior of a newly-designed light-weight Al1.5CrFeMnTi HEA. Coherent precipitation of the L21 phase within the BCC matrix at intermediate temperatures was observed, and their size, shape, coherency, and spatial distribution can be tuned through selected annealing treatments. Moreover, the CALPHAD and first-principle calculations successfully optimize the compositions of light-weight HEAs with coherent BCC/L21 two-phase structure. Shed light by the present study, novel light-weight HEAs, featuring lower density (below 6 g/m3) and lower cost, can be designed for high-temperature and cost-effective light-weight applications.
||Planned: Supplemental Proceedings volume