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Abstract
The influence of microstructural instability on long time creep life prediction has been investigated using Al alloy 6061 as a model material. The effect of microstructural changes on lifetime during long time creep, was determined by measuring the influence of microstructural degradation on steady state creep rate through the use of accelerated aging and short time creep tests. It was observed that at intermediate stresses at 260 and 288°C the creep life was strongly influenced by the rate of microstructural degradation and method proposed by other workers are effective in predicting creep life. At low stresses it was found that creep lives for times approaching 100000 hare adequately predicted by performing short time creep tests on fully overaged specimens and using simple extrapolation techniques. The results indicate that a knowledge of the aging response of alloys can be used to predict long time creep lives with reasonable accuracy.