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Quantification of sensitization in AA5083-H131 via imaging Ga-embrittled fracture surfaces
journal contributionposted on 2013-01-01, 00:00 authored by N Birbilis, R Zhang, M Lim, Rajeev Gupta, C Davies, S Lynch, J Scully
Sensitization of 5xxx series Al alloys involving precipitation of β phase (Mg2Al3) at grain boundaries was studied for different exposure times at 100°C upon AA5083-H131 (UNS A95083). In this work, we reveal that fracture surfaces prepared by liquid gallium embrittlement can yield a quantification of grain boundary β phase with significant statistics on β phase size and spacing. This information is a necessary first step toward development of quantitative damage models to describe inter-granular corrosion (IGC) and stress corrosion (IGSCC).