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Suppression of the Portevin–Le Chatelier effect by electric current in AMg6 alloy

Annotation

The direct current-induced suppression of the Portevin-Le Chatelier (PLC) effect has been revealed and investigated in Al-6wt. Mg alloy during tensile tests at a constant strain rate. Suppression of the PLC effect by direct electric current manifests itself as an increase in the critical strain e for the onset of serration flow with increasing current density exceeding a certain critical value ~10-50 А/mm . The obtained results show that the observed suppression of jerky flow by electric current is not directly associated with Joule heating per se of the whole sample. Possible mechanisms of the phenomenon are discussed.

Keywords

Portevin-Le Chatelier effect; electroplasticity; direct electric current; Al-Mg alloy; precipitation; electromigration

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UDC

53.043

Pages

105-111

References

1. Spitsyn V.I., Troitskiy O.A. Elektroplasticheskaya deformatsiya metallov. M., 1985. 160 s. 2. Troitskiy O.A., Baranov Yu.V., Avraamov Yu.S., Shlyapin A.D. Fizicheskie osnovy i tekhnologii obrabotki sovremennykh materialov. Teoriya, tekhnologiya, struktura i svoystva: v 2 t. M.: In-t komp'yuternykh issledovaniy, 2004. T. 1. 592 s. 3. Troitskiy O.A., Baranov Yu.V., Avraamov Yu.S., Shlyapin A.D. Fizi-cheskie osnovy i tekhnologii obrabotki sovremennykh materialov. Teoriya, tekhnologiya, struktura i svoystva: v 2 t. M.: In-t komp'yuternykh issledovaniy, 2004. T. 2. 468 s. 4. Brechet Y., Estrin Y. On the influence of precipitation on the Portevin–Le Chatelier effect // Acta Metal. Mater. 1995. V. 43. № 3. P. 955. 5. Brechet Y., Estrin Y. On the relations between Portevin–Le Chatelier plastic instabilities and precipitation // Key Engineering Materials. 1994. V. 97-98. P. 235. 6. Rizzi E., Hahner P. On the Portevin–Le Chatelier effect: theoretical modeling and numerical results // International Journal of Plastisity. 2004. V. 20. P. 121. 7. Dolinsky Yu., Elperin T. Thermodynamics of nucleation in current-carrying conductors // Phys. Rev. B. 1994. V. 50. P. 52. 8. Livshits B.G., Kraposhin V.S., Linetskiy Ya.L. Fizicheskie svoystva metallov i splavov. M., 1980. 320 s. 9. Blech I.A. Electromigration in thin aluminum films on titanium nitride // J. Appl. Phys. 1976. V. 47. №. 4. P. 1203.

Received

2014-12-19

Section of issue

Scientific articles

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