Interfacial adhesion of alumina thin films over the full compositional range of ternary fcc alloy films: A combinatorial nanoindentation study

Materials & Design

卷:193

Jean-Marc Breguet¹  Ivo Utke²  Calum Ferguson³  Mikhail Polyakov⁴  Rachel Schoeppner⁴  Barbara Putz⁴  Aidan A. Taylor⁴  Johann Michler⁴  Laszlo Pethö⁴  Carlos Guerra-Nuñez⁴ 

[1] Corresponding author.;

[2] Alemnis AG, Thun, Switzerland;

[3] Department of Materials Science and Metallurgy, 27 Charles Babbage Rd, University of Cambridge, Cambridge CB3 0FS, UK;

[4] Empa, Swiss Federal Laboratories for Materials Science and Technology, Thun, Switzerland;

关键词: Combinatorial materials;    Thin films;    Adhesion;    Nanoindentation;    Atomic layer deposition;    Sputtering;   

DOI  :  

来源: DOAJ

【 摘 要 】

Combinatorial materials design of thin films allows one to investigate fundamental mechanic relationships and optimize films for engineering applications. Using a newly integrated shutter controller, specifically developed for precise control over coating design, ternary alloys with full compositional range can be deposited onto single wafers. Programmable shutters allow one to create multilayered thickness gradients of two or three different materials, which can then be annealed to create films with large compositional gradients. Two 50 nm fcc alloys (AlCuAu, AuAgPd) were magnetron sputtered onto (0001) sapphire wafers. The changing chemical composition across the wafer was investigated with energy dispersive x-ray spectroscopy and transmission electron microscopy. AlCuAu showed multiple phases and intermetallics across the wafer, whereas for AuAgPd a solid-solution was observed. Both alloys were coated with 400 nm Al2O3 (atomic layer deposition, ALD), to investigate their potential as adhesion layers for ALD coatings. Adhesion of the bilayers across the wafer was measured with instrumented nanoindentation, producing well-defined delamination-blisters. Small arrays of indents placed over the surface, each location corresponding to different adhesion layer compositions, illustrate adhesion-promoting properties of numerous interface compositions in single samples. For the two bilayer systems, adhesion mapping revealed the areas of optimum adhesion layer composition for best adhesion properties.

【 授权许可】

Unknown