Role of coarse intermetallic particles on the environmentally assisted cracking behavior of peak aged and over aged Al–Zn–Mg–Cu–Zr alloy during slow strain rate testing

Kannan, M. Bobby, and Raja, V.S. (2007) Role of coarse intermetallic particles on the environmentally assisted cracking behavior of peak aged and over aged Al–Zn–Mg–Cu–Zr alloy during slow strain rate testing. Journal of Materials Science, 42 (14). pp. 5458-5464.

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Abstract

Coarse intermetallic particles (larger than 1 μm in size) in Al–Zn–Mg–Cu–Zr (7010) alloy were found to significantly influence the crack initiation of the over aged alloy while not affecting the more susceptible peak aged alloy, when subjected to slow strain rate testing (SSRT) in 3.5% NaCl solution. A detailed study was undertaken to examine the causes of such an observation. The study shows that the galvanic action and/or dealloying of the coarse intermetallic particles are responsible for the crack initiation in the over aged alloy. However, this phenomenon is not seen in the peak aged alloy due to its inherent environmentally assisted cracking (EAC) susceptibility and the consequent failure in shorter duration, before the coarse particles can exert an influence.

Item ID: 9600
Item Type: Article (Refereed Research - C1)
ISSN: 1573-4803
Date Deposited: 10 Apr 2010 03:07
FoR Codes: 09 ENGINEERING > 0912 Materials Engineering > 091207 Metals and Alloy Materials @ 100%
SEO Codes: 86 MANUFACTURING > 8611 Basic Metal Products (incl. Smelting, Rolling, Drawing and Extruding) > 861101 Basic Aluminium Products @ 100%
Citation Count from Web of Science Web of Science 6
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