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Meeting	2020 TMS Annual Meeting & Exhibition
Symposium	Mechanical Response of Materials Investigated through Novel In-situ Experiments and Modeling
Presentation Title	Synthesis and Mechanical Behavior of Freestanding NiTi Films with Varying Grain Sizes
Author(s)	Paul Rasmussen, Jagannathan Rajagopalan
On-Site Speaker (Planned)	Paul Rasmussen
Abstract Scope	Here, we describe a new process to synthesize thin films with precise microstructural control via systematic, in-situ seeding of nanocrystals, and subsequent crystallization of amorphous precursor films. Based on this process, we synthesized Cr-seeded NiTi films with nanocrystalline and submicron grain sizes, and different phase compositions by methodically varying the annealing treatments. We then co-fabricated freestanding samples of the films with MEMS testing stages and performed cyclic tensile load-unload experiments. While all samples exhibited the shape-memory effect, the underlying deformation mechanisms were notably different. Films with submicron grains that initially had a mixed austenite/martensite microstructure deformed via a combination of phase transformation of austenite grains alongside detwinning of martensite grains. The nanocrystalline films initially had a fully austenitic microstructure and deformed via combination of phase transformation and plasticity. Preliminary in-situ TEM straining suggest that inelastic strain recovery in these films is caused by both reverse phase transformation and reverse plasticity.
Proceedings Inclusion?	Planned: Supplemental Proceedings volume

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