Whether the aluminum alloy plate can be heat-treated and strengthened is mainly determined by the alloying elements of the aluminum plate, because the aluminum alloy is strengthened by solution treatment + aging, so whether heat treatment strengthening can be performed depends on whether the elements constituting the alloy can be dissolved. In the case of a solid solution, and the degree of solid solubility changes with temperature, if the alloying element cannot be dissolved into the solid solution, the heat treatment strengthening has no effect. If it is soluble, the degree of solid solubility changes with temperature is insufficient, and the heat treatment strengthening effect is obtained. Not big, it is also the dice to light the wax.
For example, iron and nickel are basically not dissolved in solid aluminum. Therefore, aluminum alloy containing these elements cannot be heat-treated and strengthened. Silicon and manganese have relatively small solid solubility in aluminum and little change with temperature. Magnesium and zinc have Larger solubility, but the structure of the compound formed with aluminum is not much different from the matrix, and the strengthening effect is very small. Therefore, binary aluminum-iron, aluminum-nickel, aluminum-silicon, aluminum-manganese, aluminum-magnesium, aluminum-zinc The alloy is not heat-treated and strengthened. Since the 3A21 aluminum alloy plate is an AL-Mn alloy, it cannot be heat-treated and strengthened.
Of course, if a reinforced element is added to the binary alloy to form a ternary, quaternary, or multi-element alloy, heat treatment may be performed.
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