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I have been told that I should not use alloy 5083 at elevated temperatures. Why is that?

The 5000 series alloys with a magnesium content greater than 3% are susceptible, when held within the temperature range 66ºC to 230ºC, to the risk of creating a sensitive metallurgical structure that can result in stress corrosion. The length of time at temperature is a critical factor in determining the degree of sensitization.