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Effect of superimposed oscillations on characteristics of Al-40 wt.% Zn alloy

Published online by Cambridge University Press:  15 December 2000

F. Abd El-Salam ,
A. M. Abd El-Khalek  and
R. H. Nada
F. Abd El-Salam*
Affiliation:
Physics Department, Faculty of Education, Ain Shams University, Cairo, Egypt
A. M. Abd El-Khalek
Affiliation:
Physics Department, Faculty of Education, Ain Shams University, Cairo, Egypt
R. H. Nada
Affiliation:
Physics Department, Faculty of Education, Ain Shams University, Cairo, Egypt
*
[email protected]
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Abstract

Marked effect of imposed low frequency oscillations with amplitudes of 6.6 × 10−4−11.6 × 10−4 during creep of pre-aged Al-40 wt.% Zn alloy samples under constant stress at 423 K, was observed. Increasing the frequency or amplitude at a certain temperature, increased both n and ${\dot \varepsilon}_{\rm st}$ but decreased β values. The value of the ratio γ (0.75−0.77) shows the high dependence of the steady creep on the transient creep stage. The results were explained in view of the nature of the thermally induced structures during aging and their mode of interaction with lattice defects generated by the applied stress and the imposed oscillations. Grain boundary sliding and grain boundary diffusion of Zn and Al are suggested as the rate controlling mechanisms for both the transient and steady creep stages, respectively.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 12 , Issue 3 , December 2000 , pp. 159 - 167
Copyright
© EDP Sciences, 2000

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