caa a22 4500 388020962 CHVBK 20180307124924.0 cr unu---uuuuu 161130e199803 xx s 000 0 eng 10.1557/JMR.1998.0078 doi S0884291400043156 pii (NATIONALLICENCE)cambridge-10.1557/JMR.1998.0078 Characterization of superdislocation dissociations in Al66Ti25Cr9 with transmission electron microscopy observations and image simulations [Elektronische Daten] The nature of dissociated superlattice dislocation cores in Al66Ti25Cr9, deformed at room temperature, has been characterized by weak-beam transmission electron microscopy (TEM) and comparison of experimental images with computer-simulated images. The displacement fields associated with narrowly dissociated APB- and SISF-dissociated ‹110› superdislocations were calculated to account for the asymmetry in dislocation contrast and led to a better understanding of the formation of images. Such calculations are a powerful aid, when coupled with image simulations, in distinguishing the "real” intensity peaks from the supplementary peaks that can be generated under experimental imaging conditions. While both APB- and SISF-dissociated superdislocations were identified, the vast majority of superdislocations were determined to be APB-dissociated. Corrected values of the fault energies (γAPB and γSISF ) have been measured for this alloy. These energies and the observed dissociations are shown to be self-consistent. Copyright © Materials Research Society 1998 Kumar Mukul Department of Mechanical Engineering, The Johns Hopkins University, Baltimore, Maryland 21218-2686 Hemker K. J. Department of Mechanical Engineering, The Johns Hopkins University, Baltimore, Maryland 21218-2686 Journal of Materials Research Cambridge University Press 13/3(1998-03), 610-624 0884-2914 13:3<610 1998 13 JMR https://doi.org/10.1557/JMR.1998.0078 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1557/JMR.1998.0078 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kumar Mukul Department of Mechanical Engineering, The Johns Hopkins University, Baltimore, Maryland 21218-2686 NATIONALLICENCE 700 1- Hemker K. J. Department of Mechanical Engineering, The Johns Hopkins University, Baltimore, Maryland 21218-2686 NATIONALLICENCE 773 0- Journal of Materials Research Cambridge University Press 13/3(1998-03), 610-624 0884-2914 13:3<610 1998 13 JMR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge