About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Refractory Metals 2024
|
Presentation Title |
Controlling the Sources of Interstitial Constituents in Refractory Complex Concentrated All |
Author(s) |
Calvin H. Belcher, Sakshi Bajpai, Vivek Verma, Benjamin MacDonald, Diran Apelian, Enrique Lavernia |
On-Site Speaker (Planned) |
Calvin H. Belcher |
Abstract Scope |
Recent findings reveal that interstitial constituents, especially oxygen and nitrogen, inadvertently introduced during processing in refractory complex concentrated alloys (RCCAs) significantly convolute observations of ductility and strength of the alloys at room temperature. Plasma arc melting (PAM) has facilitated the quest for RCCAs showcasing remarkable combinations of strength and ductility. In this work, we studied the composition and chemistry of residual gases in the PAM chamber environment during arc melting using a mass spectrometer to better quantify methodologies to control sources of oxygen and nitrogen. Moreover, thermodynamic mechanisms of the absorption of interstitial constituents were investigated by arc melting MoNbTaW and NbTiZr RCCAs. Furthermore, a H2 rich reducing environment was utilized to remove interstitial constituents during PAM. With respect to interstitial constituents, the RCCAs were characterized using electron microscopy and atom probe tomography. Analyses of mechanical properties and microstructures of the as-cast RCCAs elucidated the influence of the interstitial constituents. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Temperature Materials, High-Entropy Alloys, Process Technology |