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Role of nanostructure in pitting of Al–Cu–Mg alloys by K.D. Ralston; N. Birbilis; M.K. Cavanaugh; M. Weyland; B.C. Muddle; R.K.W. Marceau is a Engineering article available to read on EtoBox.

What is Role of nanostructure in pitting of Al–Cu–Mg alloys about?

Aluminium alloys possess a unique combination of strength and low density, which historically have made these alloys ideal for many structural applications. However, addition of alloying elements in appreciable concentrations, in particular Cu and Mg, make Al-alloys inherently susceptible to localised corrosion. In this work, we adopt a bottom-up approach in an attempt to quantify the critical microstructural feature size (viz. precipitate size) that is capable of triggering a cascade of pitting events and eventual degradation of corrosion resistance. This is accomplished by exploiting the well characterised hardening response in a model alloy, Al-1.1Cu-1.7Mg (at.%), for which pitting resistance of the alloy was tracked with aging time and hence microstructural evolution. Corrosion performance and microstructural characterisation were carried out using a combination of electrochemical testing, coupled with high-resolution scanning transmission electron microscopy (HRSTEM) and atom probe tomography (APT). Results indicate, at least for this particular alloy, that second phase features below a critical width of approximately 3 nm can be tolerated from a corrosion perspective. This st

Who reads Role of nanostructure in pitting of Al–Cu–Mg alloys?

Author

K.D. Ralston; N. Birbilis; M.K. Cavanaugh; M. Weyland; B.C. Muddle; R.K.W. Marceau

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0013-4686)

Published

2010

Language

EN

Field

Engineering (Physical Sciences)