| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Heterostructured and Gradient Materials (HGM VI): Principle, Processing and Properties
|
| Presentation Title |
Tuning the Mechanical Behavior of Heterostructured Nanotwinned-Nanocrystalline Ni Films |
| Author(s) |
Rohit Berlia, Jagannathan Rajagopalan |
| On-Site Speaker (Planned) |
Jagannathan Rajagopalan |
| Abstract Scope |
Heterostructured metals and alloys evade the strength-ductility trade-off commonly observed in their homogeneous coarse-grained and nanocrystalline counterparts. However, methods to precisely tune the microstructure of heterostructured metals are lacking, and hence it is difficult to systematically study the effect of different microstructural parameters on their mechanical behavior. In this work, we introduce a new method to synthesize heterostructured Ni films with precisely defined nanotwinned and nanocrystalline domains. We varied the microstructural architecture and the relative volume fractions of the nanocrystalline and nanotwinned domains in these films and measured their uniaxial tensile stress – strain response using MEMS devices. Increasing the volume fraction of the nanotwinned domains led to lower strength but higher uniform elongation. Interestingly, two films with similar volume fractions of nanotwinned and nanocrystalline domains but contrasting architectures exhibited markedly different mechanical properties. Our results highlight the prominent role of microstructural architecture in determining the properties of heterostructured metals. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Thin Films and Interfaces, |