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Portevin-Le chatelier instabilities in Al-3 Mg conditioned by strain rate and strain

1993; Elsevier BV; Volume: 41; Issue: 5 Linguagem: Inglês

10.1016/0956-7151(93)90253-o

1873-2879

J. Balı́k, P. Lukáč,

Metal Forming Simulation Techniques

The critical strains for the occurrence of the Portevin-Le Châtelier effect have been measured as a function of the strain rate for Al-3 Mg alloy polycrystals deformed at room temperature. Experimental results are compared with the model proposed by Kubin and Estrin. It is shown that the explanation of the occurrence of the onset termination of jerky flow at low strain rates needs new information to modify the evolution law for the densities of forest and mobile dislocations used by Kubin and Estrin.