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Question: problems 41 an alloy of unknown composition was heated to...

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PROBLEMS 4.1 An alloy of unknown composition was heated to temperature T1 and then quenched rapidly to room temperature T3. After quenching, hardness readings for the alloy were low. The material was then reheated to an intermediate temperature T2 for varying lengths of time. Room temperature hardness was found to increase progressively to a maximum before decreasing with longer exposures to the Tz exposure. Speculate on the nature of the phase diagram 156 CHAPTER 4 STRENGTHENING MECHANISMS IN METALs corresponding to this alloy, the approximate composition of the alloy, and the location of the temperatures mentioned above. Speculate on the strengthening mechanisms responsible for this hardness-time profile.

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