Dissemination of IT for the Promotion of Materials Science (DoITPoMS)

DoITPoMS Micrograph Library Full Record for Micrograph 842

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 Link to MATTER Glossary entry for aluminium, copper
Categories
Metal or alloy
System
Al-Cu   Link to phase diagram
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-Non-Commercial-Share Alike 2.0 UK: England & Wales