Aluminum alloy Grains, Which alloy is it?

In summary, the conversation is about identifying the type of aluminum based on photos taken after grinding, polishing, and etching with Keller's Reagent. The speaker believes it is a 2xxx aluminum, possibly cold worked, and mentions the grain size measurements for three different images. They ask for help and there is a link shared for more information.
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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?

-Link
 

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  • ,66x18,2,,1.JPG
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  • 1x18,3,2.JPG
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  • ,66x18x4.JPG
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Based on the information provided, it is difficult to definitively determine which specific alloy the aluminum grains belong to. However, the grain size measurements suggest that it is a 2xxx aluminum, which are commonly used in structural applications due to their high strength and toughness. The cold working also supports this conclusion, as 2xxx alloys are often cold worked to improve their properties. Additional testing and analysis may be necessary to accurately identify the specific alloy.
 

1. What are the common types of aluminum alloy grains?

The common types of aluminum alloy grains are equiaxed, columnar, and elongated.

2. What is the difference between equiaxed and columnar grains?

Equiaxed grains are randomly oriented and have equal dimensions in all directions, while columnar grains are elongated and aligned in one direction.

3. Which alloy has the best combination of strength and ductility?

This can vary depending on the specific application, but generally speaking, aluminum alloy 7075 has a good balance of strength and ductility.

4. How are alloy grains formed?

Alloy grains are formed during solidification of molten aluminum. The rate of solidification and the presence of impurities can affect the type and size of grains formed.

5. Can the grain structure of aluminum alloys be altered?

Yes, the grain structure of aluminum alloys can be altered through processes such as heat treatment, mechanical deformation, and grain refinement techniques like equal channel angular pressing.

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