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Meeting 2023 TMS Annual Meeting & Exhibition
Symposium Advanced Real Time Imaging
Presentation Title Thermal Stability of fcc-bcc Nanolaminates Containing 3D Interfaces
Author(s) Justin Y. Cheng, Zezhou Li, Shuozhi Xu, Jon K. Baldwin, Mauricio De Leo, Irene J. Beyerlein, Khalid Hattar, Nathan A. Mara
On-Site Speaker (Planned) Justin Y. Cheng
Abstract Scope Bimetallic nanolaminates have been used to study the influence of interface energetics on static annealing-induced microstructure and mechanical property evolution in nanocrystalline alloys. It has been shown that PVD-synthesized Cu/Nb nanolaminates with atomically sharp heterophase interfaces and layer thicknesses above a few tens of nm maintain lamellar microstructures and retain as-deposited nanohardness after annealing. However, this degree of thermomechanical stability is not achieved when nanolaminate layer thickness drops below a few tens of nanometers. We show here using ex situ annealing, in situ TEM annealing, and nanoindentation that introduction of 3D interfaces containing chemical and structural heterogeneities in all spatial dimensions in Cu/Nb nanolaminates allows for retention of lamellar microstructure and associated nanohardness after annealing up to 600C for 1 hr. This finding demonstrates a new method of engineering thermal stability of thermodynamically metastable structures in nanolamellar composites.
Proceedings Inclusion? Planned:
Keywords Nanotechnology, Thin Films and Interfaces, High-Temperature Materials


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