The objective of this study is to determine the effect of solution treatment temperature, quenching media, and various machining sequences on the warpage behavior of aluminum 7249 alloy aged to T6 and T7' tempers. Large extrusions of 7249 aluminum alloy with fins were cut into 108 "T" sections. The samples were solution-treated, aged, and machined. Three solution temperatures (445, 474, and 505 A degrees C), two quenching media (water and 20% polyalkylene glycol), two aging treatments (T6 and T7'), and three machine sequences were used. The flatness of the samples was measured on the surfaces orthogonal to the z-axis. Three points were on top of both shoulders (six total), six were at the bottom of the sample, and six were on the top of the fin, in the cases where the fin was not milled off. They were then averaged together by surface to represent the overall warpage of each sample.
Copyright 2011 ASM International. This paper was published in Journal of Materials Engineering and Performance, Volume 20, Issue 7, pp. 1230-1234 and is made available as an electronic reprint with the permission of ASM International. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplications of any material in this paper for a fee or for commercial pruposes, or modification of the content of this paper are prohibited. Available on publisher's site at http://rd.springer.com/article/10.1007/s11665-010-9756-4#.
Keleshian, N., Kyser, R., Rodriguez, J., Cueva, C., Vega, V., Lee, E.W., Ogren, J., and Es-Said, O. S., 2011, "On the Distortion and Warpage of 7249 Aluminum Alloy After Quenching and Machining," Journal of Materials Engineering and Performance, 20(7), pp. 1230-1234.