Characterization of Cr-Bearing Intermetallics Causing Pinhole Formation in Twin Roll Cast 8079 Aluminum Alloy Thin Foils

80798079 alloyAlloys, produced by the twin roll castingTwin-roll casting methodMethod, is widely used in the production of thin foils due to its hardnessHardness and elongation properties. However, some quality problems must be overcome in cold rolled foils that are thinned to a thickness of around 7 microns. At the beginning of the problems that need to be solved, pinholePinhole formationsFormation whose number is above the acceptance criteria come. In this study, pinholesPinhole caused by intermetallicIntermetallics or intermetallicIntermetallics-like structures containing Cr were investigated. However, in order to solve the problem, it should be known which metallurgical or mechanicalMechanical reasons cause pinholePinhole formationFormation. A number of characterizationCharacterization methodsMethod were applied to foil samples. It is aimed to make inferences about which production step or which operationOperation in the castingCasting system is the source of the problem.