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On the relation between the Luders deformation and grain boundary structure in aluminium alloy

Authors
  • Timoshenko, Yu. B.
Publication Date
Jan 01, 1990
Source
HAL
Keywords
Language
English
License
Unknown
External links

Abstract

Strain hardening of the fine grained AlMg6 alloy at room temperature was studied after the alloy annealing and preliminary superplastic deformation (SPD) at different strain rates. Electron microscopy, measurements of conventional yield stress, and strain hardening analysis indicated that SPD in regions II and III, corresponding to optimal and higher strain rates respectively, transformed the alloy into a state which prevented lattice dislocations from running into grain boundaries. At the same time, the equilibrium state of grain boundaries observed after annealing in state I (low strain rates), facilitates the generation and running of dislocations into grain boundaries and provides for the Luders deformation.

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