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Influence of Stress and Temperature on Short-Transverse Stress Corrosion Cracking of an Al-4.2Zn-2.5Mg Alloy / W. J. Helfrich

Conference Author
Stress Corrosion Testing (1966 : Atlantic City, N. J.)
Physical Description
1 online resource (10 pages) : illustrations, figures, tables
Additional Creators
Helfrich, W. J., American Society for Testing and Materials, and ASTM International
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Summary
Stress corrosion cracking of an age-hardened Al-Zn-Mg alloy (7039) subject to continuous immersion in a 1 N NaCl solution was studied at stresses of 5 to 55 ksi and temperatures of 30 to 100 C and found to be an activated process. The rate, r, of stress corrosion (proportional to the inverse failure time) can be expressed as: r=r0exp{¿̐ư[Q*(O)¿̐ưsV*]/RT} where Q* (O) is the activation energy in the absence of stress, s, and V* is the activation volume. Q* (O) has a value of 20 ¿̐ư 0.8 kg¿̐ưcal/mole, and V* is approximately 28 to 34 cm3/mole for applied stresses of 25 ksi or higher. It is suggested that the rate-determining step in the stress corrosion of 7039 involves anodic dissolution of MgZn2 at grain boundaries. The mechanism of stress corrosion cracking is discussed with reference to previously derived models.
Dates of Publication and/or Sequential Designation
Volume 1967, Issue 425 (January 1967)
Subject(s)
Other Subject(s)
ISBN
9780803168084 (e-ISBN)
9780803166387
0803166389
Digital File Characteristics
text file PDF
Bibliography Note
Includes bibliographical references 19.
Other Forms
Also available online via the World Wide Web. Tables of contents and abstracts freely available; full-text articles available by subscription.
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Also available in PDF edition.
Reproduction Note
Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 1967. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.
Technical Details
Mode of access: World Wide Web.
Source of Acquisition
ASTM International PDF Purchase price USD25.
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