Manifestation of the Portevin-Le Chatelier effect in the Kh20N80 alloy |
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Authors: | N R Dudova R O Kaibyshev V A Valitov |
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Affiliation: | (1) Institute for Problems of Metal Superplasticity, Russian Academy of Sciences, ul. S. Khalturina 39, Ufa, 450001, Russia |
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Abstract: | It has been found that the single-phase nickel alloy Kh20N80 demonstrates discontinuous flow in the range of deformation temperatures of 300–650°C. It is shown that the discontinuous flow of this alloy possesses signs of the Portevin-Le Chatelier effect, strong localization of deformation, and negative strain-rate sensitivity of the flow stress. Furthermore, three specific features of the discontinuous flow of the Kh20N80 alloy have been revealed: (1) the “normal” dependence of the critical degrees of the onset of the discontinuous flow of ?cr on the strain rate; (2) the “inverse” temperature dependence of ?cr; and (3) the positive temperature dependence of the flow stress. These special features appear to be caused by the formation of a short-range-order structure, which occurs in this alloy at temperatures of approximately 350–500°C. |
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