Abstract
Tests on an industrial copper alloy containing grain-boundary precipitates were carried out at 923 K under constant load conditions and in a vacuum of 6.7 × 10−1 Pa. Three types of creep test were performed: (a) specimens were held at stresses in the range 9–20 MPa for a period of 15 h; (b) tests at 11 and 15MPa were conducted for various times up to fracture; (c) specimens were taken to fracture at stresses in the range 11–39 MPa. Grain-boundary damage was observed to occur by the formation and interlink age of grain-boundary cavities. The interlinkage of the cavities was observed to occur by a grain-boundary tearing process. Quantitative metallographic examination revealed that the extent of cavitation damage increased with stress and time in Test Series A and B, and in Test Series C the rate of damage accumulation increased with increase in stress. From these observations an approach to predict the time to rupture was developed. The prediction of the time to rupture is also discussed in terms of an empirical creep-rupture parameter.
Published Version
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