TiNi shape memory alloy thin films for microactuator application
Name
AMMNS031.pdf
Size
990.9 KB
Format
Adobe PDF
Checksum (MD5)
c45fecc0469aab2b355c69a8e7c8e755
Author(s)
Fu, Yongqing
Du, Hejun
Date Issued
January 2003
Series/Report no.
Advanced Materials for Micro- and Nano-Systems (AMMNS);
Abstract
TiNi films were prepared by co-sputtering TiNi target and a separate Ti target. Crystalline structure and phase transformation behaviors of TiNi films were investigated. Results showed that TiNi films had fine grain size of about 500 nm and fully martensitic structure at room temperature. X-ray photoelectron spectroscopy (XPS) results indicated that there is adherent and natural TiO₂ film, which is beneficial to its corrosion resistance and biocompatibillity. Results from differential scanning calorimeter (DSC), in-situ X-ray diffraction (XRD) and curvature measurement revealed clearly martensitic transformation upon heating and cooling. The TiNi films were further deposited on micromachined silicon cantilever and membrane structures in order to form micro-gripper or microvalve with large deformation due to shape-memory effect.
Subjects
TiNi thin film
sputtering
shape memory
martensitic transformation
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