|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Multi-Principal Elements Alloys X
||Optimizing Microstructure and Mechanical Properties of Multi-principal Elements Alloys via Thermal Treatments
||Gian Song, Jongtae Kim, Ho-Seop Song, Soon-Jik Hong, Jin Kyu Lee, Ki Buem Kim, Jun Hyun Han, Chanho Lee, Peter K. Liaw
|On-Site Speaker (Planned)
There have been extensive efforts to simultaneously improve the strength and ductility of CrMnFeCoNi multi-principal elements alloy, also known as high-entropy alloy (HEA). For example, diverse alloy design concepts have been reported, such as precipitation strengthening (Al and/or Ti addition) and phase separation (Cu substitution). However, there is no systematic studies on the effect of thermal treatments on the microstructure and mechanical properties of such precipitate-hardened or phase-separated HEAs yet. In this study, the microstructure and mechanical properties of two HEAs, one HEA strengthened by precipitates and the other HEA reinforced via phase-separation, have been systematically investigated according to thermal treatments at 500 ~ 1200 ˚C. The microstructural evolution according to the thermal treatments was characterized using X-ray diffraction, scanning-electron microscope, electron-backscattered diffraction, and transmission-electron microscope to study the structures of the precipitates and phase-separation behavior, whereas the mechanical properties were evaluated by Vickers hardness and tension tests at room temperature. In this presentation, the important microstructural parameters determining the mechanical properties, such as strength and ductility, will be discussed.