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Effect of forging and rolling deformation on corrosion resistance of aluminum alloy 2519A plate

ZHANG Xin-ming1,LIU Ying1,2,LI Hui-zhong1,TANG Jian-guo1,LIU Bo1,GAO Hui1,LI Hui-jie1 (1.School of Materials Science and Engineering,Central South University,Changsha 410083,China;2.Dept.of Materials Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)  
To improve corrosion properties of aluminum alloy 2519A plate,the effects of forging and rolling deformation on microstructures and corrosion resistance were investigated by optical microscopy(OM),transmission electron microscopy(TEM) and orientation distribution function(ODF).Results show that compared with the precipitate free zones(PFZ) in the rolled plate,those in the forged plate are wider and the distance between the precipitates along grain boundaries(GBs) is larger.Upon etchant immersion a continuous corrosion path is hard to form in the forged plate,which leads to higher resistance of intergranular corrosion and exfoliation corrosion.Two galvanic cells coexist between PFZ-matrix and precipitates along GBs-PFZ,of which the precipitates with large distance along GBs determine SCC resistance,i.e.forged plate has better stress corrosion cracking properties(KISCC=32.1 MPa·m1/2) than rolled plate(KISCC=22.1 MPa·m1/2).The orientation density of {100} texture is much lower in forged plate.The size and distribution of the second phase play a key role in the corrosion resistance of aluminum alloy 2519A plate.
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