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HVEM In‐situ Deformation Investigations on Cyclically Deformed Nickel Single Crystal
Author(s) -
Mecke K.,
Messerschmidt U.
Publication year - 1979
Publication title -
kristall und technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0023-4753
DOI - 10.1002/crat.19790141106
Subject(s) - burgers vector , materials science , dislocation , deformation (meteorology) , nickel , single crystal , crystallography , frank read source , crystal (programming language) , in situ , position (finance) , stress (linguistics) , partial dislocations , composite material , condensed matter physics , metallurgy , physics , chemistry , linguistics , philosophy , finance , computer science , meteorology , economics , programming language
In‐situ deformation investigations were carried out on thin foils of a nickel single crystal which was cyclically pre‐deformed. The motion of dislocations does not start in the whole specimen simultaneously but begins at localized places in the dislocation‐poor regions. The plastic deformation may be characterized by a collective movement of dislocations. Measurements of the effective stress show its characteristic dependence on the position in the direction of the Burgers vector. There are clear indications of structural changes in the dense regions of dislocations at strains exceeding the cyclic total strain amplitude.