What happens to aluminum after solution heat treatment as it ages?

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Multiple Choice

What happens to aluminum after solution heat treatment as it ages?

Explanation:
After solution heat treatment, aluminum alloys that respond to aging are left in a supersaturated solid solution. As aging occurs, solute atoms diffuse and form fine precipitates that hinder the movement of dislocations. This obstruction makes the material harder and stronger, so hardness increases during aging until a peak is reached. If aging continues beyond the peak, the precipitates coarsen and lose some effectiveness, and hardness can start to decline. Therefore, the best answer reflects that hardness increases as aging progresses.

After solution heat treatment, aluminum alloys that respond to aging are left in a supersaturated solid solution. As aging occurs, solute atoms diffuse and form fine precipitates that hinder the movement of dislocations. This obstruction makes the material harder and stronger, so hardness increases during aging until a peak is reached. If aging continues beyond the peak, the precipitates coarsen and lose some effectiveness, and hardness can start to decline. Therefore, the best answer reflects that hardness increases as aging progresses.

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