Determine the decay ratio of a system, if a step change of magnitude 6 is introduced. Y(s) 1 X(s) s² +3.6s +6 a) 0.0011 b) 0.0025 c) 0.0565 d) 0.085

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The fraction recrystallized-time data for the recrystallization at 350°C of a previously deformed aluminum are tabulated here. Assuming that the kinetics of this process obey the Avrami relationship, determine the fraction recrystallized after a total time of 116.8 min. Assume y1 = 0.38 and y, = 0.73. Fraction Recrystallized Time (min) 95.2 126.6 i