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Observations on deformation characteristics and microstructure in an AlMg alloy during serrated flow

✍ Scribed by J.M. Robinson; M.P. Shaw

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
857 KB
Volume
174
Category
Article
ISSN
0921-5093

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✦ Synopsis

The Portevin-Le Chatelier effect (discontinuous plastic flow) has been investigated in an A1-4.5wt.%Mg alloy as a function of three different microstructural conditions. Transmission electron microscopy has been used to relate differences in the observed macroscopic deformation characteristics to dislocation distributions in specimens before and after tensile straining. It is demonstrated that differences in initial yield behaviour are determined by the availability of preexisting dislocations and that the characteristic yield drop in annealed material arises from the mass creation of mobile dislocations. Pre-macro-yield features are also rationalized in terms of observed local dislocation activity.

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