Journal
JOURNAL OF APPLIED PHYSICS
Volume 105, Issue 3, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3075773
Keywords
copper alloys; friction; metallic thin films; nickel alloys; shape memory effects; sputtered coatings; surface morphology; surface roughness; surface tension; titanium alloys
Categories
Funding
- AcRF [RG9/04]
- Provincial Laboratory Open Fund of Liaoning Province at Shenyang Jianzhu University [JG200710]
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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.
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