Hubungan Antara Besar Butir dengan Kekuatan dan Kekerasan pada Aluminium Paduan Berbutir Kasar

Harsono Wirjosumarto & Rudy Setyo Purnomo

Hall-Petch relation, σ_t = σ_i + KD^-1/2, is re-examined and tested to a coarse grain aluminum alloy with grain size between 0.069 mm and 0.404 mm. The result indicates that the theoretical and experimental value of K match each other closely, i.e. K_th = 0.0514 and K_exp = 0.052. 0n the other hand the experimental value of the exponent is -1.86 instead of -0.5. The experimental relation between hardness number and strength matches reasonably well to the theoretical analysis, which is linear. The experimental value of the linearity constant is C_exp = 0.335 and the theoretical constant is C_th= 0.35 ÷ 0.39, therefore this aluminum alloy the relation is σ_t = 0.335 BHN. The grain size difference of the specimen was obtained by strain-annealed method by varying the annealing temperature at constant strain and annealing time.

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