| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
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Deformation-induced Manipulation of Defect Structures and Hierarchical Microstructures
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| Presentation Title |
The Role of Deformation Induced Defects on Phase Evolution in High Entropy Alloys |
| Author(s) |
Abhishek Sharma, Sriswaroop Dasari, Bharat Gwalani, Mohan Sai Kiran Nartu, Yao-Jen Chang, Stephane Gorsse, An-Chou Yeh, Rajarshi Banerjee |
| On-Site Speaker (Planned) |
Rajarshi Banerjee |
| Abstract Scope |
Though a fine scale second phase distribution is a potent strengthening mechanism for alloys, achieving high precipitate density is often difficult owing to sluggish precipitation kinetics and limited heterogeneous nucleation sites. More specifically in case of transition element based complex concentrated alloys (CCAs) or High Entropy Alloys (HEAs), precipitation of equilibrium phases, e.g., ordered B2 or sigma phase, can be limited due to their high nucleation barrier for homogeneous precipitation within the face-centered cubic (FCC) matrix. This can lead to the competing homogeneous nucleation of a metastable ordered L12 phase which has a substantially lower nucleation barrier. Using different CCAs/HEAs as examples, deformation processing has been employed to introduce a large number density of homogeneously distributed heterogeneous nucleation sites within the FCC matrix, to manipulate the phase fraction, morphology, and distribution of the equilibrium precipitates. This approach of tailoring microstructure is widely applicable to other multi-component alloys including RHEAs. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Phase Transformations, Shaping and Forming |