Microstructure evolution and dislocation configurations in nanostructured Al–Mg alloys processed by high pressure torsion
作者： Man-ping LIU , Ting-hui JIANG , Xue-feng XIE , Qiang LIU , Xue-feng LI
DOI: 10.1016/S1003-6326(14)63542-1
关键词:
摘要: Abstract Microstructure evolution and dislocation configurations in nanostructured Al–Mg alloys processed by high pressure torsion (HPT) were analyzed transmission electron microscopy (TEM) high-resolution TEM (HRTEM). The results show that the grains less than 100 nm have sharp grain boundaries (GBs) are completely free of dislocations. In contrast, a density as 1017 m−2 exists within larger 200 these usually separated into subgrains cells. dislocations 60° full with Burgers vectors ½ most them appear dipoles loops. microtwins stacking faults (SFs) formed Shockley partials from dissociation both mixed 0° screw ultrafine simultaneously observed HRTEM HPT alloys. These suggest partial emissions, well activation could also become deformation mechanism ultrafine-grained aluminum during severe plastic deformation. refinement associated very local density, cells non-equilibrium GBs, SFs proposed.
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