Abstract
The aim of this work is to show that creep voids or cavities are observed at the secondary stage of the creep curve. Using commercially pure aluminum, creep damage tests were carried out at the temperatures of 200°C and 250°C. Creep tests were interrupted at several points in the creep curve, and the number of creep voids, creep void area per a unit area, and change in density in specimens were measured to evaluate creep damage. It was found that creep voids were formed in the middle of secondary creep when the fracture mode was intergraunlar, and that they developed rapidly with increasing creep strain. The creep damage parameterω introduced by Kachanov and Rabatonov agreed with the dimensionless value of change in density. There was no significant difference between secondary and tertiary creep in view of the creep damage measured.
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