Microcantilever bend testing and finite element simulations of HIP-ed interface-free bulk Al and Al-Al HIP bonded interfaces

• Published in: Philosophical magazine (Abingdon, England) England), 2013-07, Vol.93 (21), p.2749-2758
• Main Authors: Mara, Nathan A., Crapps, Justin, Wynn, Thomas A., Clarke, Kester D., Antoniou, Antonia, Dickerson, Patricia O., Dombrowski, David E., Mihaila, Bogdan
• Format: Article
• Language: English
• Subjects: Aluminum; aluminum alloys; Applied sciences; Bend tests; bending test; Condensed matter: structure, mechanical and thermal properties; Elasticity, elastic constants; Elasticity. Plasticity; Equations of state, phase equilibria, and phase transitions; Exact sciences and technology; finite element analysis; Hot isostatic pressing; hot isostatic pressing (HIP); Mechanical and acoustical properties of condensed matter; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Mechanical properties of solids; Metals. Metallurgy; nanoindentation; Nanostructure; Physics; Segregations; Solubility, segregation, and mixing; phase separation; Strain; Strength; Yield strength
• ISSN: 1478-6435; 1478-6443
• DOI: 10.1080/14786435.2013.786192

We report on the strength of Al-Al interfaces and the effects of chemical segregation and interfacial void formation on bond strength using microcantilever bend testing. Interfaces are synthesised via hot isostatic pressing. Microcantilevers of several nominal dimensions were fabricated via focused ion beam and deformed in a nanoindenter. We find increased cantilever strength as a function of decreasing sample size, with a linear dependence of the yield strength on the inverse square root of the length scale characteristic to the cantilever cross-section. The presence of pores and chemical segregation decreases the yield strength of the material by 17% and the accommodated strain energy by 10-15% for strain values in the 6-12% range.