In general,the activation energy for irreversible deformation processes in spatially extended crystalline systems (SECS)is related with the phenomenology and mechanics for plastic flow,creep and superplastic flow.Earlier investigations have reported the analysis on effect of grain size,the effect of precipitates and the effect of chemical composition ratio on the activation energy in SECS.In addition,according to the nature of direct observations of the microstructure of a tension test micro specimen of a SECS after superplastic deformation,the model of cooperative grain boundary sliding by the glide cellular dislocations is supported and the results obtained are the deductive rule to establish the unified interpretation of plastic flow and superplastic flow in SECS [1-4].In this way some experimental results reported in the past had been analyzed in order to establish the model to predict the value of the activation energy for irreversible deformation processes in SECS.
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