Deformation defects and electron irradiation effect in nanostructured Al-Mg alloy processed by severe plastic deformation
Journal article, Peer reviewed
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Original versionTransactions of Nonferrous Metals Society of China. 2012, 22 (8), 1810-1816. 10.1016/S1003-6326(11)61391-5
In order to explore the exact nature of deformation defects previously observed in nanostructured Al-Mg alloys subjected to severe plastic deformation, a more thorough examination of the radiation effect on the formation of the planar defects in the high pressure torsion (HPT) alloys was conducted in this paper using high-resolution transmission electron microscopy (HRTEM). The results show that high densities of the defects in the HRTEM images disappear completely when these images expose under the electron beam for some duration of time. At the same time, lattice defects are never been observed within no-defect areas even when the beam-exposure increases to the degree that holes appear in the areas. Therefore, the HRTEM examinations confirm that the planar defects observed in the HPT alloys are mainly resulted from the significant plastic deformation and are not due to the radiation effect during HRTEM observation.