|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Multi-Principal Elements Alloys X
||Microstructure, high temperature oxidation and mechanical properties of Fe-Cr-Ni-Al Medium Entropy Alloy
||Yu-Jin Hwang, Kyu-Sik Kim, Young-Sang Na, Ka-Ram Lim, *Kee-Ahn Lee
|On-Site Speaker (Planned)
Fe-based medium entropy alloy is a material that has recently attracted interests because it can lower alloying cost and has excellent mechanical properties compared to high entropy alloy. In this study, non-equiatomic Fe-Cr-Ni-Al medium entropy alloy (MEA) was proposed, and its microstructure, high temperature oxidation behavior and mechanical properties was investigated. Fe-Cr-Ni-Al MEA consisted of BCC Fe-Cr-rich matrix and B2 Ni-Al-rich precipitates about 150 nm size. Isothermal oxidation tests were performed at 900, 1100 ℃ in air for 24 hrs. As a result, outstanding oxidation resistances could be obtained in this MEA alloy. After isothermal oxidation, α-Al2O3 layer was uniformly distributed at surface regardless of oxidation temperature. Room temperature and 550 ℃ compression test results showed that the compressive yield strengths were 1150 MPa and 757 MPa, respectively. Based on the above results, the effect on the microstructural characteristic on the oxidation and strengthening mechanisms were also discussed.