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- Title
Microstructure and Temperature Dependent Indentation Response of Additively Manufactured Precipitation-Strengthened Al<sub>0.3</sub>Ti<sub>0.2</sub>Co<sub>0.7</sub>CrFeNi<sub>1.7</sub> High Entropy Alloy.
- Authors
Nartu, Mohan Sai Kiran Kumar Yadav; Jha, Shristy; Chesetti, Advika; Mukherjee, Sundeep; Van Rooyen, Isabella; Banerjee, Rajarshi
- Abstract
The temperature-dependent [from room temperature (RT) to 500°C] nanoindentation behavior of a precipitation-strengthened Al0.3Ti0.2Co0.7CrFeNi1.7 high-entropy alloy (HEA) processed via two different additive manufacturing (AM) techniques was investigated in the as-deposited and annealed conditions. The hierarchically heterogeneous microstructures were achieved via simple one-step annealing treatments, exploiting the residual stresses in the AM-processed HEA to partially recrystallize the microstructure, performed remarkably better than the nearly homogeneous microstructures in the as-deposited state. The one-step annealed conditions revealed < 6.6% reduction in hardness values at 500°C compared to RT, while the as-deposited conditions showed a > 18% reduction in the hardness. The one-step annealed conditions also exhibited significantly higher hardness than the as-deposited conditions owing to their L12-strengthened FCC microstructures. Furthermore, serrated yielding or the Portevin-Le Chatlier effect indicative of microstructural instability was observed during nanoindentation deformation (at 500°C) for the as-deposited conditions but not for the one-step annealed conditions. This, therefore, signifies the robustness of the hierarchically heterogeneous microstructures at elevated temperatures presenting a strong avenue for tuning the HEAs for future nuclear reactor applications.
- Subjects
MICROSTRUCTURE; FACE centered cubic structure; NUCLEAR reactors; RESIDUAL stresses; HIGH temperatures; NANOINDENTATION; TITANIUM
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2023, Vol 75, Issue 12, p5046
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-023-06129-2