Abstract
The influence of very large deformations on the properties and microstructures of A199.95 and A199.992 is investigated. The very large deformations are imposed by the cyclic extrusion-compression (CEC) method, which combines extrusion and compression processes. It is found that above true strains of 4 and 8 respectively, the compression proof stresses of A199.992 and A199.95 stabilize. The property stabilization appears to result from the increasing incidence of micro bands which leads to the final constancy of the microstructure parameters. The homogeneous chess-board like microstructure forms during the deformation by the CEC method, as the result of rearrangement of microstructure by the mutually crossing microbands leading to the final dominance of persistent macro shear bands.RésuméOn a étudié l'influence de très grandes déformations sur les propriétés et la microstructure de l'Al 99.95 et de l'Al 99.992. De très grandes déformations sont imposées par la méthode d'extrusioncompression cyclique (CEC), qui combine des processus d'extrusion et de compression. Au-delà de déformations réelles de 4 et 8 respectivement, les limites apparentes d'élasticité sous compression de l'AI 99.992 et de l'Al 99.95 se stabilisent. Cette stabilisation de la propriété a l'air de résulter de l'augmentation de l'occurrence de micro-bandes, ce qui méne à la constance finale des paramètres de microstructure. La microstructure homogène à apparence d'échiquier se forme lors de la déformation par la méthode CEC, comme résultat du réarrangement de la microstructure par les micro-bandes qui s'entrecroisent mutuellement, menant à la domination finale de bandes persistantes de macro-cisaillement.
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