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Article Dans Une Revue Journal of Applied Physics Année : 2009

Reversible surface morphology in shape-memory alloy thin films

Résumé

IReversible 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.
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Dates et versions

hal-00446799 , version 1 (13-01-2010)

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Ming-Jie Wu, Wei-Min Huang, Yongqing Fu, Franck Chollet. Reversible surface morphology in shape-memory alloy thin films. Journal of Applied Physics, 2009, 105 (3), pp.033517. ⟨10.1063/1.3075773⟩. ⟨hal-00446799⟩
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