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- 저자 : J. Tarasiuk (검색결과 2 건)
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Recrystallization Textures-Two Types of Modelling
Wierzbanowski, K.,Tarasiuk, J.,Bacroix, B.,Sztwiertnia, K.,Gerber, P. 대한금속재료학회 2003 METALS AND MATERIALS International Vol.9 No.1
Dislocation density is assumed to be the stored energy in a deformed material, i.e., the driving force in recrystallization. It can be estimated in diffraction experiments and it can also be predicted. Model calculations for b.c.c. structure give higher dislocation density for the orientations of the γ fibre compared with those of the α one. This explains the observed increase of γ fibre intensity (and decrease of α intensity) in the recrystallization texture of low-carbon steels, because nuclei appear preferentially in high stored energy regions. Hence, the oriented nucleation behaviour explains the texture change in this case. In other materials the oriented growth behaviour dominates. Phenomenological laws state that only these nuclei grow intensively which have a given misorientation with the deformed matrix. This description is frequently verified in f.c.c. metals and generally reported misorientations are 30°-50° rotations around the <111> axis. The above approach leads to good predictions of recrystallization textures in copper, brass and aluminium. The predicted results are still improved assuming that only these nuclei which are able to consume many deformed grains simultaneously (with different crystal orientations) grow effectively. Consequently, so-called compromise criterion and compromise functions are defined.
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Microstructure Characteristics of ECAP Processed 1050 Aluminum After Deformation and 5 Years Later
M. Wroński,K. Wierzbanowski,R. Malik,S. Wroński,D. Wojtas,A. Baczmański,J. Tarasiuk 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.8
Modifcation of microstructure parameters of severely deformed 1050 aluminum after 5 years of recovery at ambient temperature was studied. The samples of 1050 aluminum were extruded using ECAP technique. The EBSD maps were recordedfor the initial material and for the deformed samples. Next, the latter samples were left at ambient temperature during 5 yearsand a full EBSD study of the material was repeated. It was found that all microstructure parameters and textures have changedafter this period. This is due to recovery and partial recrystallization, which took place in the samples during 5 years. Thepresented modifcations of material microstructure are important, e.g., in the aspect of long time service of mechanical partsproduced by severe plastic deformation techniques
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