|About this Abstract
||Materials Science & Technology 2019
||Controlled Synthesis, Processing, and Applications of Structural and Functional Nanomaterials
||A Novel Synthesis Method for Independent Control of Grain Size, Dispersion and Phase Composition of Thin Films
||Paul Rasmussen, Rohit Sarkar, Jagannathan Rajagopalan
|On-Site Speaker (Planned)
Controlling the micro/nanostructure of thin films is essential to tailoring their mechanical properties. Here, we describe a new process to synthesize thin films with exceptional microstructural control via systematic, in-situ deposition of crystalline seeds into amorphous precursor films. When the amorphous films are subsequently crystallized by annealing, the seeds act as preferential nucleation sites and enables independent control of the grain size, dispersion and spatial distribution. Moreover, by appropriately choosing the seed element, the phase composition of the films can also be systematically varied. We demonstrate the viability of this method by synthesizing NiTi films with highly controlled microstructures composed of pure austenite or pure martensite phase using Cr and Ti seeds, respectively. In addition to controlling the microstructure and phase composition, this method also facilitates crystallization at lower temperatures, which can potentially reduce precipitate formation and, thus, enhance the mechanical properties of NiTi films.
||Definite: At-meeting proceedings