That is, when the alloy was aged at 450 and 500 °C, respectively, the relationship curves between Vickers hardness and aging time showed a trend of first descending, then ascending, and then descending again.
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That is, when the alloy was aged at 450 and 500 °C, respectively, the relationship curves between Vickers hardness and aging time showed a trend of first descending, then ascending, and then descending again.