The changes in internal friction of technically pure iron and a nickelchromium alloy at various stages of creep exhibit the folio-wing features: a) during the unsteady creep, the level of internal friction (its peak in the case of iron) decreases continually; b) during steady creep, the internal friction remains steady; c) during accelerated creep, the internal friction increases.
The changes of the elastic modulus and internal friction of the Ni-Cr alloy during the first and third creep stages proceed in opposite directions.
The changes of the investigated physical properties during creep are determined by the condition of the dislocation structure of the metal and principally by the changes of density of ready-to-move dislocations. The rule of the structural creep theory with regard to the density changes of free-to-move dislocations at different creep stages was confirmed.
The internal friction and elastic modulus are significantly affected by the microstructure of the metal. Processes causing the formation in the structure of micro-volumes with non-uniform properties can disturb the observed regularities.
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Oding, I.A., Lozinskii, M.G. & Gordienko, L.K. The effect of creep at elevated temperatures on internal friction and elastic modulus of metals. Met Sci Heat Treat 1, 27–33 (1959). https://doi.org/10.1007/BF00837031
- Elastic Modulus
- Elevated Temperature
- Opposite Direction