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Metallurgical Transactions A

, Volume 12, Issue 11, pp 1939–1943 | Cite as

The effect of copper content and heat treatment on the stress corrosion characteristics of Ai-6Zn-2Mg-X Cu alloys

  • B. Sarkar
  • M. Marek
  • E. A. Starke
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Abstract

The effect of copper and aging on the stress corrosion characteristics of Al-6 pct Zn-2 pct Mg-(0.01-2.1) pct Cu alloys in 3.5 pct NaCl was studied with other variables remaining constant. In the peak-strength condition the crack velocity in the stress-independent region decreased by two orders of magnitude when copper was increased from 0.01 to 2.1 pct. In the stress-dependent region crack velocity decreased only for copper contents higher than 1 pct. Overaging further reduced the plateau crack velocity in all the alloys studied. The results are interpreted on the basis of the effects of copper and aging on the deformation mechanism and electrochemical activity of the phases.

Keywords

Crack Growth Rate Stress Corrosion Stress Corrosion Crack Copper Content Crack Velocity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© American Society for Metals and the Metallurgical Society of AIME 1981

Authors and Affiliations

  • B. Sarkar
    • 1
  • M. Marek
    • 2
  • E. A. Starke
    • 2
  1. 1.Exxon Enterprises, Materials DivisionOld Buncombe at PoplarGreer
  2. 2.Fracture & Fatigue Research Laboratory, School of Chemical EngineeringGeorgia Institute of TechnologyAtlanta

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