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The yield stress for a particular alloy with average grain diameter of 0.03m is 230MPa. At a grain diameter of 0.02m the yield stress is

The yield stress for a particular alloy with average grain diameter of 0.03m is 230MPa. At a grain diameter of 0.02m the yield stress is 250MPa. (a) At what grain diameter will the yield stress be 175MPa ? (Use the Hall-Petch equation to answer this.) (b) It takes 10min heat treatment at 500C for grains in this alloy to grow from 0.02m to 0.03m. Assuming the exponent n=2 in the empirical equation for grain growth, dnd0n=Kt, how long will it take for the grain diameter to reach your answer to (a)

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