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Which of the following is not a stage of the age-hardening process?

Which of the following is not a stage of the age-hardening process? Correct Answer Tempering

For age-hardening of alloys, it must be first solutionized by heating into a single phase region. Then the alloy must be rapidly quenched into the two-phase region. Lastly, fine-scale transition structure as small as 100 angstrom is formed due to aging above room temperature.

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