About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior at the Nanoscale VIII
|
| Presentation Title |
High-resolution Nanoindentation mapping of Heterogeneous Nanostructured Inconel 725 coatings |
| Author(s) |
Ikponmwosa Iyinbor, Jin Wang, Ruth Schwaiger, Andrea Hodge |
| On-Site Speaker (Planned) |
Ikponmwosa Iyinbor |
| Abstract Scope |
Heterogeneous nanostructured materials (HNMs) feature graded microstructures that enable enhanced strength–ductility combinations. This study investigates local variations in microstructure, phase, and mechanical behavior across the cross-section of sputtered Inconel 725 coatings using high-resolution in situ nanoindentation mapping integrated with scanning electron microscopy and energy-dispersive X-ray spectroscopy. The coatings comprise different-sized domains composed of equiaxed grains, nanotwins, abnormally large grains (ALGs), delta-phase, and Cr- and Mo-rich carbides, whose distributions evolve with thickness and heat-treatment. The influence of domain-specific characteristics such as grain morphology, subtle crystallographic orientation changes, and carbide distributions on mechanical properties is examined. The measured modulus values fall within the expected range for Ni-based superalloys, with minor domain-to-domain variations attributed to orientation differences. Domains containing ALGs exhibited lower hardness compared to adjacent regions, while Mo-rich carbides increased strength in otherwise similar domains. The property trends provide novel insights for optimizing strength-ductility across gradient architectures in Ni-based superalloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Characterization, |