The grain boundary character distribution in thermomechanically processed rare earth bearing magnesium alloy

The present work was conducted to examine the grain boundary character distribution in a rare earth elements bearing magnesium alloy during thermomechanical processing (TMP). To this end, the friction stir processing was applied as an effective TMP scheme through single and completely overlaid three...

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Bibliographic Details
Published in:Journal of alloys and compounds 2019-08, Vol.798, p.158-166
Main Authors: Jamili, A.M., Zarei-Hanzaki, A., Abedi, H.R., Minárik, P.
Format: Article
Language:English
Subjects:
Alloying elements
Bearing
Deformation
Dynamic recrystallization
Friction stir processing
Grain boundaries
Grain refinement
Magnesium alloys
Magnesium base alloys
Preferred orientation
Rare earth elements
Special boundaries
Stability
Substructures
Texture
Thermomechanical processing
Thermomechanical treatment
Twinning
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Summary:The present work was conducted to examine the grain boundary character distribution in a rare earth elements bearing magnesium alloy during thermomechanical processing (TMP). To this end, the friction stir processing was applied as an effective TMP scheme through single and completely overlaid three-pass trials. The results indicated that along with the progressive substructure development and significant grain refinement, the fractions of coincidence site lattice boundaries were also increased in processed materials. The twin based special boundaries (holding 15b character) and the perfect coincidence ones (holding 13a character) were found as the most common coincidence site lattice boundaries. These were directly resulted from the occurrence of twinning induced dynamic recrystallization and progressive lattice rotation, respectively. The higher strain accumulation at the twin based boundary indicated the higher instability of them in comparison to the perfect coincidence one. The deformed microstructures were also consisted of a new specific kind of high angle grain boundary holding the rotating axis of . The tilt nature of the boundary plane distribution was well approved the relatively stable character of this new type of special boundary. The micro-textures of the processed materials were also examined and the preferred orientation of developed special boundaries were characterized. •Development of ultrafine and homogenous microstructure through thermomechanical processing.•Appreciable population of twin and dislocation based coincidence site lattice boundaries.•A new kind of special high angle grain boundaries were developed through processing.•Boundary plane distribution modeling to assess the tilt, twist or mixed characters of boundaries.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2019.04.306