Effect of Pre-Rolling Reduction on Intergranular Corrosion of Aluminum Alloy 2519A
The effect of pre-rolling reduction prior to ageing on the size and distribution of the precipitates, the width of precipitation free zones (PFZ) along grain boundaries and intergranular corrosion (IGC) of aluminum alloy 2519A were investigated by hardness tests, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The experimental results showed that the time for peak-age shortened when the reduction increased, which resulted in refining the precipitatates and distributing homogeneously within the grains and hence the IGC decreased. With increasing pre-rolling reduction, the PFZ along grain boundaries became narrower and precipitates changed from continuous chains to discrete distribution, which resulted in high IGC resistance.
Yafang Han et al.
Y. Liu et al., "Effect of Pre-Rolling Reduction on Intergranular Corrosion of Aluminum Alloy 2519A", Materials Science Forum, Vols. 546-549, pp. 1117-1122, 2007