Effect of Microstructure on Pit-to-Crack Transition of 7075-T6 Aluminum Alloy / Kimberli Jones, David W. Hoeppner
- Conference Author:
- Fatigue and Fracture Mechanics: 35th Volume (35th : 2005 : Reno, Nevada)
- Physical Description:
- 1 online resource (10 pages) : illustrations, figures, tables
- Additional Creators:
- Jones, Kimberli
Hoeppner, David W.
American Society for Testing and Materials
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- The focus of this research was to gain an increased understanding of how microstructure influences pit growth, pit-to-crack transition, and critical crack propagation to fracture. Two thicknesses of 7075-T6 aluminum alloy were etched and subjected to corrosion fatigue in a 3.5 % sodium chloride environment. 7075-T6 aluminum alloy is of particular interest to the aging aircraft community, as this alloy has been used extensively on wing and fuselage structures for both military and commercial aircraft in the past. Testing was interrupted at various intervals to obtain information on pit generation, growth, and potential cracking. Results indicated that microstructure has a significant influence on pit-to-crack transition and fatigue crack propagation. Short cracks (< 100 ?m) in a corrosion fatigue environment were strongly influenced by grain boundaries and crystallographic grain orientation. Constituent particles competed with corrosion pits as critical crack nucleation sites. Post-fracture analysis confirmed the presence of noncritical cracks within the corroded region, related to pitting and constituent particles.
- Dates of Publication and/or Sequential Designation:
- Volume 2007, Issue 1480 (January 2007)
- 9780803162471 (e-ISBN)
- Digital File Characteristics:
- text file PDF
- Bibliography Note:
- Includes bibliographical references 13.
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- 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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- Reproduction Note:
- Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 2007. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.
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- Mode of access: World Wide Web.
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- ASTM International PDF Purchase price USD25.
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