| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
High Temperature Oxidation of Metals and Ceramics
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| Presentation Title |
Microstructure, High Temperature Oxidation and Mechanical Properties of Fe-Cr-Ni-Al Medium Entropy Alloy |
| Author(s) |
Yu-Jin Hwang, Kyu-Sik Kim, Young-Sang Na, Ka-Ram Lim, Kee-Ahn Lee |
| On-Site Speaker (Planned) |
Yu-Jin Hwang |
| Abstract Scope |
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 common high entropy alloys. In this study, non-equiatomic Fe-Cr-Ni-Al medium entropy alloy (MEA) was proposed, and its microstructure, high temperature oxidation and mechanical properties were investigated. Fe-Cr-Ni-Al MEA consisted of BCC Fe-Cr-rich matrix and B2 Ni-Al-rich precipitates about 150nm size. Isothermal oxidation tests were performed at 800, 900, 1000, 1100℃ in air environment for 24 hrs. As a result, outstanding oxidation resistances could be confirmed in this MEA alloy. After isothermal oxidation, α-Al2O3 layer was uniformly distributed at specimen surface regardless of oxidation temperature. Room temperature and 550℃ compression test results showed that the compressive yield strengths were 1150MPa and 757MPa, respectively. Based on the above results, the effect on the microstructural characteristic on the oxidation mechanism and deformation behavior were also discussed. |