Al-Cu-Mg sheet metals with low levels of residual stress

Year	Description
1996	Invention patented by Fabrice Heymes, Philippe Lequeu, and Guy-Michel Raynaud on June 16th, 1996. Abstract: A metal sheet with a total thickness >0.5 mm comprising an AlCuMg aluminum alloy consisting essentially of Al and, in percent by weight: 3.5 < Cu < 5.0 1.0 < Mg < 2.0 Si < 0.25 Fe < 0.25 Mn < 0.55 ______________________________________ all other elements: <0.25 with 050% at all points and a deviation in recrystallization rate between surface and mid-thickness <35%, the sheet having in the quenched and stretched state or in the quenched, stretched and annealed state, a deflection after machining to mid-thickness of a bar resting on two distant supports with a length l such that: where f is the deflection expressed in micrometers, e being the thickness of the sheet in mm and l is the length of the bar in mm.
Source: selected by the editor from original sources.

Invention: Al-Cu-Mg sheet metals with low levels of residual stress