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Paper Information

Journal:   IRANIAN JOURNAL OF MATERIALS SCIENCE AND ENGINEERING   MARCH 2014 , Volume 11 , Number 1; Page(s) 27 To 38.
 
Paper: 

DISLOCATIONS STRUCTURE AND SCATTERING PHENOMENON IN CRYSTALLINE CELL SIZE OF 2024 AL ALLOY DEFORMED BY ONE PASS OF ECAP AT ROOM TEMPERATURE

 
 
Author(s):  GOODARZY M.H.*, ARABI H., BOUTORABI M.A., SEYEDEIN S.H., SHAHROKHI H.
 
* SCHOOL OF METALLURGY AND MATERIALS ENGINEERING, IRAN UNIVERSITY OF SCIENCE ANDTECHNOLOGY, TEHRAN, IRAN
 
Abstract: 

Variation in microstructural features of 2024 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 C11, C22 and C44. The effect of dislocations contrast .factor on the anisotropic strain broadening of diffraction profiles was considered for measuring the microstructuralfeatures 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 4.28x 1012m-2 to 2.4x1014m-2 after one pass of cold ECAP and the fraction of edge dislocations in the solution annealed sample increased from 43% to 74% 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 0.83mm to about 210nm after one pass of ECAP process at room temperature.

 
Keyword(s): ECAP, 2024 ALUMINUM ALLOY, XRD, PEAK BROADENING, DISLOCATION CONTRAST FACTOR
 
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