|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||High Entropy Alloys VIII
||J-86: Development of Metastable Nanolaminate High Entropy Alloy Overcoming Strength-ductility Trade-off
||Minseok Kim, Kook Noh Yoon, Hyun Seok Oh, Eun Soo Park
|On-Site Speaker (Planned)
Strength and ductility are the most important physical properties in evaluating structural materials. Unfortunately, common strengthening strategies in most conventional alloys cause sacrifice of ductility inevitably and vice versa. Recently, however, high-entropy alloy (HEA) is regarded as a good candidate that can overcome the strength-ductility trade-off. In the present study, we attempt to design the unique HEA microstructure with nano-thickness austenite film in hard martensite phase matrix. First of all, we made fully martensite HEA by controlling relative phase stability of martensite and austenite phase and severe deforming process. And then low temperature tempering process was performed for partial austenitization of the martensite. As a result, the HEA exhibited a novel ‘composite-like’ microstructure with metastability of the austenite film in martensite HEA matrix, which resulted in good ductility and strength balance. This result can provide a guideline on how to overcome strength-ductility trade off by tailoring microstructure in HEA.
||Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume