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  • DIY Phone Case From Soda Cans

    With regards to the explanation why "baking" the can in the oven does indeed fix the shape, have a look at http://www.totalmateria.com/Article139.htm, in particular on the section about "Recovery". Once the dislocations defining a particular shape (i.e. a stress pattern) are gone, additional heat treatment does not further soften the metal. The "practical" advice you find on the internet (e.g. https://makeitfrommetal.com/how-to-anneal-aluminum-the-beginners-guide/ or https://process.arts.ac.uk/content/annealing-softening-aluminium-plate/index.html) has at its heart methods not to overheat and melt aluminium, while using a torch to do the heat treatment. Because these methods of temperature control are so poor, their proponents conflate "Recovery",...

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    With regards to the explanation why "baking" the can in the oven does indeed fix the shape, have a look at http://www.totalmateria.com/Article139.htm, in particular on the section about "Recovery". Once the dislocations defining a particular shape (i.e. a stress pattern) are gone, additional heat treatment does not further soften the metal. The "practical" advice you find on the internet (e.g. https://makeitfrommetal.com/how-to-anneal-aluminum-the-beginners-guide/ or https://process.arts.ac.uk/content/annealing-softening-aluminium-plate/index.html) has at its heart methods not to overheat and melt aluminium, while using a torch to do the heat treatment. Because these methods of temperature control are so poor, their proponents conflate "Recovery", "Annealing" and "Recrystallization" into a single process and then make claims that do not hold up under much better control.

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