Enhancing stress corrosion cracking resistance in Al-Zn-Mg-Cu alloy through inhibiting recrystallization

Mathan, M. Bobby, and Raja, V.S. (2008) Enhancing stress corrosion cracking resistance in Al-Zn-Mg-Cu alloy through inhibiting recrystallization. In: Proceedings of 17th European Conference on Fracture. pp. 12219-1224. From: 17th European Conference on Fracture: multilevel approach to fracture of materials, components and structures, 2 - 5 September 2008, Brno, Czech Republic.

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In this work, the effect of recrystallization inhibition in Al-Zn-Mg-Cu (7010) alloy towards the stress corrosion cracking (SCC) behavior was studied. For this purpose, Sc addition (0.25 wt. %) was made to Al-Zn-Mg-Cu alloy and the SCC behavior of the base and Sc-bearing alloys in peak-aged condition was examined using slow strain rate testing (SSRT). The base 7010 Al alloy showed 10% elongation, 9.9% reduction in area and 561 MPa ultimate tensile strength (UTS), when tested in air. The ductility of the base alloy dropped to 3% and 3.3% in terms of elongation and reduction in area, respectively, when tested in 3.5% NaCl solution, showing its high susceptibility to SCC. On the other hand, the 0.25 wt. % Sc containing alloy showed a significant improvement in ductility not only in air but also in 3.5% NaCl solution, without any loss in the UTS. Thus, the 0.25 wt. % Sc containing alloy exhibited 13.4 % elongation, 15.8% reduction in area and 560 MPa UTS in air and 12.5% elongation, 16.4% reduction in area and 560 MPa UTS in 3.5% NaCl solution. The study shows that inhibiting recrystallization in 7010 alloy through Sc addition, improves the SCC resistance substantially even in the peak aged condition.

Item ID: 15946
Item Type: Conference Item (Presentation)
ISBN: 978-80-214-3692-3
Keywords: aluminium alloy, stress corrosion cracking, heat treatment, scandium
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Date Deposited: 02 Oct 2014 01:30
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%
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