The influence of deformation path on strain characteristics of AA1050 aluminium processed by equal-channel angular pressing followed by rolling

M.C.V. VEGA; RAUL EDUARDO BOLMARO; MAURIZIO FERRANTE; V. L . SORDI; ANDREA KLIAUGA

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

ELSEVIER SCIENCE SA

Lugar: Amsterdam; Año: 2015 vol. 646 p. 154 - 162

0921-5093

The present investigation reports on the microstructure evolution, texture development, the nature of the grain boundaries and the tensile and deep drawing behaviour of commercial AA1050 Al processed by Equal Channel Angular Pressing (ECAP) plus rolling. Although in terms of final mechanical strength ECAPand rolling are indistinguishable, the deformation path is substantially different, and this has important consequences on both microstructure and texture. From the spatial distribution of high angle grain boundaries (HAGB) and low angle grain boundaries(LAGB), the fine microstructure and the crystallographic texture, it was concluded that the microstructure is oriented according to the external imposed flow: as pin movement in the ECAP process, which promotes the rotation of the cells inside the original grain, followed by a sliding movementcausedbytherolling, leading to grain elongation.The ECAPprocess is more suitable to promote a higher fraction of HAGBs, and the same time as it reduces the intensity of the bulk crystallographic texture. As a consequence an increase of the penetration depth and deformation strain, as measured by the Erichsen test, was observed in samples processed by 8ECAP passes, characterized by low texture intensity and a high degree of dynamic recrystallization.