|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Interface-driven Phenomena in Solids: Thermodynamics, Kinetics and Chemistry
||Allotropic HCP to BCC Ti Transitions in Ti/BCC Multilayered Thin Films
||Li Wan, Xiao-xiang Yu, Gregory Thompson
|On-Site Speaker (Planned)
As the length scale decreases, materials can undergo size-dependent phase changes. This work explores the HCP to BCC Ti transformations in a series of Ti/BCC multilayers of equal volume fraction. In Ti/Nb and Ti/Fe, the HCP to BCC Ti transition occurred at ~ 2 nm Ti, with Ti/Fe an additional vitrification transition at ~1 nm Ti. A series of Ti/V multilayers were also sputter-deposited and revealed a transition at ~ 1 nm Ti. These length scale stability differences are explained through a series of in situ growth stress measurements coupled to post-mortem atom probe tomography characterization. The stabilization differences are described through surface energy driven intermixing as well as epitaxial orientations of the Ti on the various BCC template layers. The experimental findings are then compared to molecular dynamic simulations to better elucidate this phase stability.
||Planned: A print-only volume