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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 which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

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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