Why Do Aluminum Sheets and Extrusions Have Different Mechanical Properties?

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SUMMARY

The mechanical properties of aluminum differ significantly between sheets and extrusions due to variations in fabrication methods, specifically thermomechanical processing. Key factors influencing these properties include alloy composition, temper, and the specific fabrication technique employed, such as cold rolling versus extrusion. Specifications for aluminum products often reference AMS standards that detail the fabrication process, ensuring consistency in material performance. Understanding these distinctions is crucial for applications requiring precise mechanical characteristics.

PREREQUISITES
  • Knowledge of aluminum alloys and tempers
  • Understanding of thermomechanical processing techniques
  • Familiarity with AMS specifications for aluminum products
  • Basic principles of metallurgy related to rolling and extrusion
NEXT STEPS
  • Research the differences between hot-rolled and cold-rolled aluminum processing
  • Study the impact of alloy composition on mechanical properties of aluminum
  • Examine the AMS specifications relevant to aluminum sheets and extrusions
  • Learn about metallurgical states produced by different fabrication methods
USEFUL FOR

Materials engineers, manufacturing professionals, and anyone involved in the design and specification of aluminum components will benefit from this discussion.

topito2
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I have noticed that the mechanical properties of aluminum vary depending on if it is provided as sheets or extrusion. Do you know why?
 
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The material properties are dependent not only on alloy and temper, but also on fabrication method (cold rolled?). In any spec that calls out the sheet, plate, strip or other form of the test specimen, they also call out the AMS spec number that outlines the way that piece was fabricated.
 
Fabrication method = thermomechanical processing, as in hot-rolled vs cold-rolled, repeated cycles of cold-work/anneal, etc.

Rolling produces a different metallurgical state than extrusion.
 

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