Microstructure of low stacking fault energy silver processed by different routes of severe plastic deformation

Hegedűs, Z., Gubicza, J., Kawasaki, M., Chinh, N.Q., Fogarassy, Z. and Langdon, T.G. (2012) Microstructure of low stacking fault energy silver processed by different routes of severe plastic deformation. Journal of Alloys and Compounds, 536, supplement 1, S190-S193. (doi:10.1016/j.jallcom.2011.10.070).

Abstract

Samples of 4 N purity Ag were processed at room temperature (RT) by equal-channel angular pressing (ECAP) and high-pressure torsion (HPT) up to 8 passes and 20 revolutions, respectively. It was found that the minimum grain size was around 200 nm for both ECAP and HPT. However, the dislocation density and the twin boundary frequency were about three times larger in HPT due to the very high applied hydrostatic pressure. The maximum dislocation density (about 1.5 × 10¹⁶ m^-2) and twin boundary frequency (about 2%) achieved by HPT at RT are extremely high among pure fcc metals and this can be explained by the difficult annihilation of the highly dissociated dislocations due to the very low stacking fault energy in Ag.

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Contributors

Author: T.G. Langdon

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