Effect of pre-deformation of rolling combined with stretching on
stress corrosion of aluminum alloy 2519A plate
stress corrosion of aluminum alloy 2519A plate
(School of Materials Science and Engineering, Central South University, Changsha 410083, China)
Abstract: The effect of the pre-deformation of rolling combined with stretching on the stress corrosion cracking resistance of aluminum alloy 2519A was studied by means of the slow strain rate technique at 10−6 s−1. The tensile strength and stress corrosion index of the alloy plate with 7% rolling plus 3% perpendicular stretching were 481 MPa and 0.0429, respectively, showing better mechanical property and stress corrosion cracking resistance than those with 4% rolling plus 3% parallel stretching or 7% rolling plus 3% parallel stretching, which is due to its finer and denser precipitates within the grains, discontinuous grain boundary precipitates, as well as more narrow precipitate-free zone width. Such microstructure is attributing to the denser and more homogeneously distributed dislocations which are produced by the pre-deformation.
Key words: 2519A aluminum alloy plate; stress corrosion cracking; pre-deformation; precipitates