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Title: The effect of laser surface treatment on stress corrosion cracking behaviour of 7075 aluminium alloy
Authors: Yue, TM 
Dong, CF
Yan, LJ
Man, HC 
Keywords: Aluminium alloy
Excimer laser
Stress corrosion
Surface treatment
Issue Date: 2004
Publisher: North-Holland
Source: Materials letters, 2004, v. 58, no. 5, p. 630-635 How to cite?
Journal: Materials letters 
Abstract: Excimer surface treatment was conducted on 7075-T651 aluminium alloy with the aim of improving the alloy's resistance to stress corrosion cracking (SCC) when tested in a NaCl solution. Using a pulse energy of 8 J/cm2, a laser-melted layer of about 8 μm thick was formed. Within the re-solidified laser-melted layer, the original grain boundaries of the wrought structure and most of the coarse constituent particles were removed. The grain boundaries of the re-solidified structure were found to be free from precipitates. The results of the SCC tests showed that after the 30-day immersion test, the untreated specimen was severely attacked with intergranular cracks that reached deep into the specimen; by contrast, no intergranular cracks were found in the laser-treated specimen. The form of corrosion attack in the laser-treated specimen took the form of corrosion pits instead. The electrochemical impedance measurements taken during the SCC test showed that the film resistance of the laser-treated specimen was always higher than that of the untreated specimen.
ISSN: 0167-577X
EISSN: 1873-4979
DOI: 10.1016/S0167-577X(03)00583-4
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