Steady state creep during transformation in Cd-Zn alloys |
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Authors: | M S Sakr A A El-Shazly M M Mostafa H A El-Sayed A A Mohamed |
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Institution: | (1) Physics Department, Faculty of Education, Ain Shams University, Cairo, Egypt;(2) Physics Department, Faculty of Science, Ain Shams University, Cairo, Egypt |
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Abstract: | Apparent steady-state creep of Cd-2 wt. % Zn and Cd-17·4 wt. %Zn alloys has been studied under different constant stresses ranging from 6·4 MPa to 12·7 MPa, near the transformation temperature of 483 K. The strain rate of the steady-state creep for both compositions has shown two temperature regions of deformation, the low-temperature region (below 483 K) and the high-temperature region above this temperature. The stress exponent m' was found to change from 4·7 to 2 for Cd-2 wt. % Zn and from 3·1 to 2·4 for Cd-17·4 wt. % Zn alloys. The activation energies in the temperature region below the transformation temperature have been found to be 84 kJ/mole for Cd-2 wt. % Zn and 70 kJ/mole for Cd-17·4 wt. % Zn alloys characterizing the mechanism of volume self-diffusion in Cd. |
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