About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Advances in Surface Engineering V
|
Presentation Title |
Microstructural Evolution and Performance of Si-based Coatings Formed on Refractory Multi-principal Element Alloys |
Author(s) |
Brady Bresnahan, David Poerschke |
On-Site Speaker (Planned) |
Brady Bresnahan |
Abstract Scope |
The large design space for refractory multi-principal element alloys (MPEAs) provides opportunities to tune alloy chemistry to simultaneously optimize the bulk and surface properties. This investigation studied alloy siliciding, which is used to improve the oxidation resistance of refractory metals. A set of MPEAs systematically exploring key composition variables related to silicide formation were produced by arc melting, and subsequently silicided by pack cementation. The effects of the alloy and powder pack compositions and temperature on the resulting layer microstructure and phase distribution were studied. Specific attention was focused on understanding partitioning of the refractory elements between silicide phases. The tendency for protective oxide formation, cracking under thermal cycling, and layer hardness were used to evaluate the composite material performance. These insights will enable coupled alloy and process design to improve oxidation resistance while taking advantage of the superior high temperature yield strengths of refractory MPEAs for potential aerospace applications. |
Proceedings Inclusion? |
Planned: |
Keywords |
Surface Modification and Coatings, High-Entropy Alloys, High-Temperature Materials |