MECHANICAL NATURE OF STRESS-CORROSION CRACKING IN Al-Zn-Mg ALLOYS - 1. EVALUATION OF THE DUCTILE RUPTURE CONTRIBUTION.

W. E. Wood, W. W. Gerberich

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

A detailed study of rapid stress corrosion cracking (SCC) in a 7075 aluminum alloy has allowed separation of the mechanical and chemical contributions. This was accomplished by combining scanning electron microscopy, stress wave emission, and crack growth rate observations as a function of testing temperature. The data obtained established an activation energy of 11. 2 kcal/mol, a stress intensity squared dependence of crack growth, and a range of 20 to 80% dimpled rupture on the fracture surfaces. Thus a two-step crack growth mechanism is proposed combining a thermally activated electrochemical process and a discontinuous mechanical jumping process.

Original languageEnglish (US)
Pages (from-to)1285-1294
Number of pages10
JournalMetall Trans
Volume5
Issue number6
StatePublished - Jan 1 1974

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