What is it about?
Aluminium alloys must be heat treated to make them useful for demanding applications like Aerospace. The heat treatment has a critical step of very rapid cooling from a temperature around 500°C to room temperature. This step shocks the material and introduces internal stresses. These internal or residual stresses can cause big problems. To remove them we can stretch, bend, or compress the material. This investigation looked at this process to capture some of the details of how it works.
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Why is it important?
This investigation specifically tried to use very small amounts of plastic strain to see just how low can you go.
Perspectives
The investigation was a mixed success. We did detect significant stress relief but using cold compression was a mistake and too hard to control. Tension or bending should offer more precise adjustment of strain.
Dr Jeremy S Robinson
University of Limerick
Read the Original
This page is a summary of: Reduction in Residual Stress during Plastic Deformation of the Aluminum Alloy 7449, Materials Performance and Characterization, January 2020, ASTM International,
DOI: 10.1520/mpc20200094.
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