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Metals 2014, 4(3), 314-321; doi:10.3390/met4030314
Article

Effect of Cu, Zn, and Mg Concentration on Heat Treating Behavior of Squeeze Cast Al-(10 to 12)Zn-(3.0 to 3.4)Mg-(0.8 to 1)Cu

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Materials Science and Engineering Department, University of Wisconsin-Milwaukee, 3200 N. Cramer St. Milwaukee, WI 53211, USA
* Author to whom correspondence should be addressed.
Received: 16 May 2014 / Revised: 10 June 2014 / Accepted: 24 June 2014 / Published: 30 June 2014
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Abstract

Aluminum Alloy AA-7034 is a high strength wrought alloy with reasonable ductility containing 10–12 wt% Zn, 2–3 wt% Mg, and 0.8–1.2 wt% Cu. This work investigates the effect of varying the concentration of Zn (10–12 wt%) and Cu (0.8–1 wt%) on the solutionizing and aging behavior of squeeze cast AA-7034 samples. The same behaviors were investigated when Mg content was increased beyond 3 wt%. The solutionizing heat treatment dissolved much of the macroscopic second phases present in the as-cast AA-7034 alloys, but a significant amount of second phases remain after solutionizing in alloys with >3 wt% Mg. The behaviors of the various Al-Zn-Mg-Cu alloys are compared to squeeze cast Al-A206 casting alloy heat-treated to the T7 condition. All Al-Zn-Mg-Cu alloys obtained higher hardness values than those obtained by Al-A206-T7.
Keywords: Al-Zn-Mg-Cu alloys; mechanical properties; heat treatment Al-Zn-Mg-Cu alloys; mechanical properties; heat treatment
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Ferguson, J.; Schultz, B.F.; Mantas, J.C.; Shokouhi, H.; Rohatgi, P.K. Effect of Cu, Zn, and Mg Concentration on Heat Treating Behavior of Squeeze Cast Al-(10 to 12)Zn-(3.0 to 3.4)Mg-(0.8 to 1)Cu. Metals 2014, 4, 314-321.

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