Effect of solidification rate on pore connectivity of aluminium foams and its consequences on mechanical properties

L�zaro, J.; Sol�rzano, E.; Rodr�guez-P�rez, M.A.; Kennedy, Andrew R.

Abstract

This study evaluates the influence of solidification rate on the generation and control of pore connectivity of closed-cell aluminium foams. Additionally, it gives the experimental support to evaluate and model the effect of this pore connectivity on the mechanical properties. A collection of AlSi10 foams produced via powder metallurgy route, with porosities between 0.65 and 0.85, were examined. During production, applied heating conditions were the same in all cases but the cooling conditions were varied in order to promote different solidification rates in a wide range (from -1 to -15 K/s). Structural characterisation was performed by gas pycnometry and X- ray microtomography while the mechanical properties were evaluated by microhardness measurements and uniaxial compression tests. Results showed a clear reduction of pore connectivity when increasing the solidification rate. The consequence is a prominent improvement of the foam strength over the one expected from just the matrix refinement. Further analysis on this relationship between the pore connectivity and the mechanical properties, has allowed to propose a correction to the theoretical model for collapse strength in closed cell foams to consider such contribution and predict more accurate results.

Citation

Lázaro, J., Solórzano, E., Rodríguez-Pérez, M., & Kennedy, A. R. (in press). Effect of solidification rate on pore connectivity of aluminium foams and its consequences on mechanical properties. Materials Science and Engineering: A, 672, https://doi.org/10.1016/j.msea.2016.07.015

• Journal Article Type: Article
• Acceptance Date: Jul 5, 2016
• Online Publication Date: Jul 6, 2016
• Deposit Date: Sep 29, 2016
• Publicly Available Date: Sep 29, 2016
• Journal: Materials Science and Engineering: A
• Print ISSN: 0921-5093
• Electronic ISSN: 0921-5093
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 672
• DOI: https://doi.org/10.1016/j.msea.2016.07.015
• Keywords: Aluminium foam; Solidification; Pore connectivity; Mechanical properties; Modelling
• Public URL: https://nottingham-repository.worktribe.com/output/802036
• Publisher URL: http://www.sciencedirect.com/science/article/pii/S0921509316307675