Full Record for Micrograph 842

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Micrograph no: 842
Brief description: Macrograph of a resistance spot weld made in two plates of 1,5mm thickness. T3 - solution heat treatment, cold working and natural ageing.
Keywords: aluminium , copper
Categories: Metal or alloy
System: Al-Cu
Composition: Al, Cu 4.5, Mg 1.5 (wt%)
Standard codes
Reaction
Processing
Applications: Typically used in aerospace industry due to excellent mechanical properties.
Sample preparation: Polished and etched with Keller's reagent (swabbed for 15-20s) then rinsed with running water and dried with compressed air.
Technique: Optical microscope, interferential contrast
Length bar: 1 mm
Further information: (AA2024-T3 RSW x40 Keller's reagent interferential contrast)
Base material characterised by elongated, plastically deformed grains. Presence of dendritic grains in the weld. The line on the left is the original plates separation line. The two short lines on the right (inside the weld) are solidification cracks.
Contributor: J Adamowski
Organisation: Department of Production Engineering, Thermoenergetics and Mathematical Models, University of Genoa, Italy
Date: 04/07/05
Licence for re-use: Attribution-NonCommercial-ShareAlike 4.0 International