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Complex-Ion Embrittlement of Silver Chloride

  • A. R. C. Westwood
  • D. L. Goldheim
  • E. N. Pugh
Conference paper
Part of the Materials Science Research book series (MSR)

Abstract

Previous studies have revealed that when polycrystalline AgCl is deformed in aqueous solutions containing complex ions of high negative charge, e.g., AgCl4 −3, Ag(SCN)4 −3, and Ag(S2O3)3 −5, the fracture mode changes from ductile and transcrystalline (as in air) to brittle and intercrystalline. In the present paper, it is demonstrated that: (1) embrittlement in chloride environments can be prevented by the presence, in solution, of inhibitor ions such as K+, Cs+, Zn+2, Cd+2, and Hg+2; (2) embrittlement can be induced by complex ions of high positive charge; and (3) monocrystals can be embrittled, providing they contain a pre-existing crack. Studies of monocrystal fracture surfaces have revealed that the fracture process is discontinuous. For this and other reasons discussed, it is concluded that embrittlement cannot be explained on the basis of a dissolution-dependent mechanism, but is more likely to be associated with the adsorption of complex ions of high charge in the vicinity of strained surface bonds. It is suggested that the charge on the complex induces a localized redistribution of the shared electrons constituting the bond, effectively reducing its strength and causing the bond to break at an abnormally low stress level.

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Copyright information

© Springer Science+Business Media New York 1966

Authors and Affiliations

  • A. R. C. Westwood
    • 1
  • D. L. Goldheim
    • 1
  • E. N. Pugh
    • 1
  1. 1.Research Institute for Advanced StudiesMartin CompanyBaltimoreUSA

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