DISLOCATIONS STRUCTURE AND SCATTERING PHENOMENON IN CRYSTALLINE CELL SIZE OF ۲۰۲۴ AL ALLOY DEFORMED BY ONE PASS OF ECAP AT ROOM TEMPERATURE

Variation in microstructural features of ۲۰۲۴ aluminum alloy plastically deformed by equal channel angular pressing (ECAP) at room temperature, was investigated by X-Ray diffraction in this work. These include dislocation density dislocation characteristic and the cell size of crystalline domains. Dislocations contrast factor was calculated using elastic constants of the alloy such as C ۱۱, C ۲۲ and C ۴۴ . The effect of dislocations contrast factor on the anisotropic strain broadening of diffraction profiles was considered for measuring the microstructural features on the base of the modified Williamson-Hall and Warren-Averbach methods. Results showed that the dislocations density of the solution annealed sample increased from ۴.۲۸×۱۰ ۱۲m-۲ to ۲.۴۱×۱۰ ۱۴m-۲ after one pass of cold ECAP and the fraction of edge dislocations in the solution annealed sample increased from ۴۳% to ۷۴% after deformation. This means that deformation changed the overall dislocations characteristic more to edge dislocations. Also the crystalline cell size of the solution annealed sample decreased from ۰.۸۳μm to about ۲۱۰nm after one pass of ECAP process at room temperature

کلیدواژه ها:

ECAP ، ۲۰۲۴ aluminum alloy ، XRD ، peak broadening ، dislocation contrast factor