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Why is the mechanical properties of the 5052 aluminum sheet unqualified?

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    Why is the mechanical properties of the 5052 aluminum sheet unqualified? It tends to show that the strength of the annealed sheet is too high or the plasticity (elongation) is too low; the strength of the annealed semi-hard product is too high and the plasticity is too low, or the strength is too low and the plasticity is too high; the strength or plasticity of the sheet in the quenched aging state Too low. The reason why the mechanical properties of the 5052 aluminum sheet failed was mainly due to the inconsistency of the chemical composition of the material and the violation of the heat treatment system and operating procedures.
The reasons for the unsatisfactory mechanical properties of the 5052 aluminum sheet due to improper heat treatment system are:
 
    1. The mechanical properties of the annealed sheet are unqualified, generally because the annealing temperature is too low or the holding time is too short; or because the heat treatment can strengthen the cooling rate of the aluminum alloy sheet after annealing is too fast.
 
    2. The mechanical properties of the annealed semi-hard products are unqualified, usually due to low annealing temperature, short holding time, or too high annealing temperature and long holding time.
 
    3. The mechanical properties of the quenched aging board are unqualified, generally due to the low quenching heating temperature or short holding time; or the cooling rate during quenching is too slow. If the heating temperature is too high due to quenching, the mechanical properties of the material can be significantly reduced.
 
    In order to obtain a sheet with acceptable mechanical properties, the heat treatment process specification must be strictly implemented to timely grasp and check the working state of the heat treatment furnace and the temperature measuring instrument. For artificially aged sheets, if the over-effect temperature is too high or the aging time is too long, the strength of the material will be lowered.
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