Question: (a) From the plot of yield strength versus (grain diameter) ?1/2 for a 70 Cu?30 Zn cartridge brass, Figure, determine values for the constants ?

(a) From the plot of yield strength versus (grain diameter)^?1/2 for a 70 Cu?30 Zn cartridge brass, Figure, determine values for the constants ?₀ and k_y in Equation 7.7.

(b) Now predict the yield strength of this alloy when the average grain diameter is 1.0 x 10^-3 mm.

Grain size, d (mm) 5x 10-3 30 10-1 102 200 150 20

Grain size, d (mm) 5x 10-3 30 10-1 102 200 150 20 100 10 50 4 12 16 d-12 (mm-1/2) 1/2 (7.7) Ty = ro + kyd-2 Yield strength (MPa) Yield strength (ksi)

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