Effect of porosity on the indentation behaviour of nanoporous alumina films. (1st January 2011)

• Record Type: Journal Article
• Authors: Bobji, M.S.; Pendyala, Prashant; Gupta, Preeti; Kalode, Pranav
• Is Part Of: International journal of surface science and engineering. Volume 5:Number 1(2011)
• Page Start: 51
• Page End: 62
• Publication Date: 2011-01-01
• Subjects: nanoporous alumina -- NPA -- nanoindentation -- surface mechanical properties -- hardness; Surfaces (Physics) -- Periodicals; Surface chemistry -- Periodicals; Surfaces (Technology) -- Periodicals; Tribology -- Periodicals; 530.417
• Languages: English
• ISSNs: 1749-785X

Abstract

Anodising aluminium in an acid electrolyte results in a porous alumina film. The pores are uniformly distributed and their structure can be controlled by varying the anodising parameters. In this study, the pore structure of the anodic alumina films is varied systematically by varying the anodising time and a subsequent pore widening chemical etch. The indentation behaviour of the resulting film is studied using a depth sensing nanoindenter. The hardness of the films was found to be decreasing with decreasing solid area fraction. Understanding the deformation behaviour of nanoporous alumina would help tailoring the mechanical properties by tuning the geometry.