| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys IV: Mechanical Behavior
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| Presentation Title |
Ramifications of Introducing Local Chemical Ordering in FCC-Based High Entropy Alloys and Its Manifestations on the Bulk Mechanical Properties via Slip Planarity |
| Author(s) |
Abhishek Sharma, Sriswaroop Dasari, Tirthesh Ingale, Chao Jiang, Bharat Gwalani, Stephane Gorsse, An-Chou Yeh, Srinivasan Srivilliputhur, Rajarshi Banerjee |
| On-Site Speaker (Planned) |
Abhishek Sharma |
| Abstract Scope |
Planar slip has been found to be an un-intended consequence of alloy design efforts in multicomponent FCC-based HEAs. In this study, we show how it affects the strength-ductility paradox while using a new alloy design paradigm. We study local ordering in a prototypical, nearly random, equiatomic CoFeNi high entropy alloy (HEA) by adding Al and Ti. Al/Ti have been chosen employing a simple thermodynamic model based on binary enthalpies of mixing, (strongly negative for Al/Ti and Co, Fe, and Ni, individually). With Al/Ti addition, we observe localized slip along multiple {111} planes, which triggers a dynamic Hall-Petch like effect by continually refining the slip length. This local ordering induced planar-slip tendency manifests itself with an increase in the tensile yield strengths of the parent CoFeNi alloy, along with a substantially improved ductility, without invoking TRIP/TWIP. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Mechanical Properties, Characterization |