Stress corrosion cracking behaviour of laser treated aluminium alloy 7075 using a slow strain rate test

Tai Man Yue, L. J. Yan, C. F. Dong, C. P. Chan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

16 Citations (Scopus)

Abstract

The effect of excimer laser surface treatment on the stress corrosion cracking (SCC) behaviour of 7075 aluminium alloy was studied in a 3·5%NaCl solution using a slow strain rate test (SSRT). The test was conducted at the open circuit potential, a constant anodic or cathodic potential. The results of the SSRT and examination of the fracture surface of the specimens showed that the laser treatment can significantly increase the SCC initiation resistance of 7075 aluminium alloy, and reduce the degree of intergranular attack. This was due to the absence of coarse constituent particles and precipitate free grain boundaries in the laser melted layer. Moreover, the thin compact Al2O3layer with nanocrystalline structures formed at the top surface of the laser melted layer serves as a barrier to retard corrosion attack.
Original languageEnglish
Pages (from-to)961-966
Number of pages6
JournalMaterials Science and Technology
Volume21
Issue number8
DOIs
Publication statusPublished - 1 Aug 2005

Keywords

  • Aluminium alloy
  • Laser processing
  • Stress corrosion

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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