Dislocation motion cannot be directly observed in bulk metals undergoing plastic deformation; indirect measurements must be performed. Drag forces on mobile dislocations dissipate mechanical energy into thermal energy; an experimental method has been developed to measure this dissipation. Experimental data are exploited in conjunction with a model of energy dissipation by dislocation motion; information about the mean density and mean velocity of mobile dislocations can thus be derived. results obtained on aluminium specimens are presented.

Dislocation dynamics by measurements of dissipation

BEGHI, MARCO
1990

Abstract

Dislocation motion cannot be directly observed in bulk metals undergoing plastic deformation; indirect measurements must be performed. Drag forces on mobile dislocations dissipate mechanical energy into thermal energy; an experimental method has been developed to measure this dissipation. Experimental data are exploited in conjunction with a model of energy dissipation by dislocation motion; information about the mean density and mean velocity of mobile dislocations can thus be derived. results obtained on aluminium specimens are presented.
dislocazioni; deformazione plastica; dissipazione
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11311/662270
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