✍ Scribed by Luboš Kloc; Emanuela Cerri; Stefano Spigarelli; Enrico Evangelista; Terence G. Langdon
No coin nor oath required. For personal study only.
Experiments were conducted to evaluate the creep properties of a 2024 aluminum alloy fabricated by powder me@lurgy processing. The creep curves exhibit a minimum creep rate followed by an extended tertiary stage prior to failure. Using the values of the minimum creep rates, the apparent stress exponents are high and variable suggesting the presence of a threshold stress. Observations using transmission electron microscopy (TEM) reveal the occurrence of a continuoas precipitation of fine particles during the tests. Although the density of these particles is dependent upon the testing conditions, quantitative measurements show that their average size is of the order of ~ 60 nm under all conditions. A temperature compensated {ime is introduced to describe the evolution of fine particles during testing, and this permits the development of a relationship which can be used to estimate the density of fine particles under any selected conditions.
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