Aluminum alloy Grains, Which alloy is it?

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SUMMARY

The discussion focuses on identifying a specific type of aluminum alloy, likely a 2xxx series, based on microstructural analysis. The aluminum samples were polished using aluminum oxide of 3 microns and etched with Keller's Reagent. Grain sizes measured according to ASTM E-112 were reported as 2.37, 3.1695, and 5.25 micrometers. The user seeks confirmation and further insights into the alloy's characteristics, particularly regarding its cold working processes such as extrusion or cold rolling.

PREREQUISITES
  • Understanding of aluminum alloy series, specifically 2xxx series.
  • Familiarity with metallographic techniques, including polishing and etching.
  • Knowledge of ASTM E-112 grain size measurement standards.
  • Experience with optical microscopy for material analysis.
NEXT STEPS
  • Research the properties and applications of 2xxx aluminum alloys.
  • Learn about Keller's Reagent and its use in aluminum etching.
  • Study ASTM E-112 for detailed grain size measurement techniques.
  • Explore the effects of cold working processes on aluminum microstructure.
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Metallurgists, materials scientists, and engineers involved in aluminum alloy identification and analysis will benefit from this discussion.

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Hey guys

I need a little help trying to identify or getting a good conclusion of what kind of aluminum I have here. These aluminum was grind and finally polished with aluminum oxide of 3 microns. After the etching of the alloy with Keller's Reagent for a couple of seconds we took the following photos at a 11.88 amplification (.66 of the lens and 18 of the camera).

I think is a 2xxx aluminum, (comparison made with other micro-photos), cold worked (extrusion or cold rolling).

The grain size (according to the ASTM E-112) for the 66x18,2,,1.JPG image is 2.37, for the 1x18,3,2.JPG 3.1695 and for the ,66x18x4.JPG 5.25

Any help?

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