| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
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| Symposium
|
Additive Manufacturing: Length-Scale Phenomena in Mechanical Response
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| Presentation Title |
Indentation Size Effects on Hardness of Ti-6Al-4V Made by Laser Directed Energy Deposition
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| Author(s) |
Janelle Hobbs, Kaka Ma |
| On-Site Speaker (Planned) |
Kaka Ma |
| Abstract Scope |
Heterogeneities, gradients, and interfaces often exist in the microstructure of the parts made by laser directed energy deposition (LDED). While micro/nano-indentation testing effectively probes local mechanical properties, indentation size effects need to be investigated to understand how the nano- or microscale mechanical behavior landscape correlates to macroscale behavior. Small-scale indentations may range from several hundreds of microns that cover several grains or multiphases, down to several hundreds of nanometers involving only a single phase or partial grain. In this work, we investigated micro- and nano-indentation derived hardness of Ti-6Al-4V parts made by LDED to reveal the mechanical response from a single α lath compared to that from large colonies of Widmanstätten α+β and martensite α’. Results suggest indentation size effect deviates from Nix Gao’s model due to variations in α lath width and/or grain aspect ratios, whereas interfacial effect was minor due to the small fractions of β phase. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Titanium, Additive Manufacturing, Other |