Reversible surface morphology in shape-memory alloy thin films

M. J. Wu, W. M. Huang, Y. Q. Fu, F. Chollet, Y. Y. Hu, M. Cai

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Reversible surface morphology can be used for significantly changing many surface properties such as roughness, friction, reflection, surface tension, etc. However, it is not easy to realize atop metals at micron scale around ambient temperature. In this paper, we demonstrate that TiNi and TiNi based (e.g., TiNiCu) shape-memory thin films, which are sputter-deposited atop a silicon wafer, may have different types of thermally-induced reversible surface morphologies. Apart from the well-known surface relief phenomenon, irregular surface trenches may appear in the fully crystallized thin films, but disappear upon heating. On the other hand, in partially crystallized thin films, the crystalline structures (islands) appear in chrysanthemum-shape at high temperature; while at room temperature, the surface morphology within the islands changes to standard martensite striations. Both phenomena are fully repeatable upon thermal cycling. The mechanisms behind these phenomena are investigated. © 2009 American Institute of Physics.

Original languageEnglish
Article number033517
JournalJournal of Applied Physics
Volume105
Issue number3
DOIs
Publication statusPublished - 2009

Fingerprint Dive into the research topics of 'Reversible surface morphology in shape-memory alloy thin films'. Together they form a unique fingerprint.

  • Cite this

    Wu, M. J., Huang, W. M., Fu, Y. Q., Chollet, F., Hu, Y. Y., & Cai, M. (2009). Reversible surface morphology in shape-memory alloy thin films. Journal of Applied Physics, 105(3), [033517]. https://doi.org/10.1063/1.3075773