Startseite Stress corrosion characteristics of AL-Li-X alloys: role of GB precipitate size and spacing
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Stress corrosion characteristics of AL-Li-X alloys: role of GB precipitate size and spacing

  • A.K. Vasudevan EMAIL logo , K. Sadananda und Thodla Ramgopal
Veröffentlicht/Copyright: 6. Juni 2017

Abstract

Stress corrosion characteristics of three alloys, AL-3Li, AL-2Li-3Cu, and 5083, were analyzed. All three alloys have anodic grain boundary (GB) precipitates (ppts) (δ, T1, and β, respectively) that show different corrosion rates with respect to the lattice H diffusion. These GB phases grow with heat treatment time. These phases affect room-temperature fracture toughness in AL-3Li and AL-2Li-3Cu alloys but not in 5083 alloy. When exposed to NaCl solution, all three GB phases dissolve. Under an applied stress, the resulting stress corrosion threshold stress intensity K1scc varies inversely with size and spacing, when the local crack tip environmental condition is established. The mechanism involved is mostly anodic dissolution with a secondary effect from hydrogen.

Acknowledgments

We thank Dr. R.E. Ricker, NIST, Md., for the electrochemistry discussions and suggestions on the chemical reaction of AL alloys in aqueous solutions. We thank Dr. N.J.H. Holroyd for the useful discussions on 5083 SCC behavior. We also thank Drs. P. Purtell and N. Apetre for the technical help. AKV dedicates this article to a dear friend, Dr. John Liu, ALCOA Labs, Pittsburgh, PA, who passed away in January 2017. John was one of the best scientists and a leader who has made major contributions to the area of aluminum alloys for over 30 years.

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Received: 2017-1-17
Accepted: 2017-5-2
Published Online: 2017-6-6
Published in Print: 2017-10-26

©2017 Walter de Gruyter GmbH, Berlin/Boston

Artikel in diesem Heft

  1. Frontmatter
  2. In this issue
  3. Editorial
  4. International Symposium on Environmental Degradation under Static and Cyclic Loads in Structural Metallic Materials at Ambient Temperatures IV (Cork, Ireland, May 29–June 3, 2016)
  5. Overview
  6. Failures of metallic components involving environmental degradation and material- selection issues
  7. Environment-induced crack initiation
  8. Modeling galvanic coupling and localized damage initiation in airframe structures
  9. Electrochemical investigation of corrosion and repassivation of structural aluminum alloys under permanent load in bending
  10. Environment-induced crack growth
  11. Relationship between electrochemical processes and environment-assisted crack growth under static and dynamic atmospheric conditions
  12. Subcritical crack growth and crack tip driving forces in relation to material resistance
  13. Impact of solution conductivity and crack size on the mechanism of environmentally assisted crack growth in steam turbines
  14. Pre-exposure embrittlement of a commercial Al-Mg-Mn alloy, AA5083-H131
  15. Stress corrosion characteristics of AL-Li-X alloys: role of GB precipitate size and spacing
  16. Environmentally assisted cracking of pipeline steels in CO2 containing environment at near-neutral pH
  17. Corrosion fatigue
  18. A method to predict fatigue crack initiation in metals using dislocation dynamics
  19. A numerical model to assess the role of crack-tip hydrostatic stress and plastic deformation in environmental-assisted fatigue cracking
  20. Examination and prediction of corrosion fatigue damage and inhibition
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