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Deformation Behavior of Intermetallics: Models and Experiments
Author(s) -
Greenberg Bella A.,
Ivanov Michail A.,
Antonova Olga V.,
Patselov Alexander M.,
Plotnikov Alex V.
Publication year - 2008
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1560/ijc.47.3-4.415
Subject(s) - intermetallic , dislocation , blocking (statistics) , chemistry , deformation (meteorology) , curvilinear coordinates , condensed matter physics , mechanism (biology) , crystallography , mechanics , composite material , materials science , geometry , physics , alloy , computer science , computer network , mathematics , organic chemistry , quantum mechanics
Abstract A sufficiently general thermally activated mechanism for extension of dislocations in some preferential direction was proposed. This mechanism comprises a necessary step of dislocation transformations that lead to blocking. The reasons for blocking of different types of dislocations in different materials are diverse. A new concept was developed concerning the possibility of thermally activated blocking of superdislocations in the absence of external stresses. Some experiments with single crystals of Ni 3 (Al, Nb) were performed. They included no‐load heating after preliminary low‐ or high‐temperature deformation. It was found that the initial dislocation structure, which included curvilinear dislocations, transformed to a set of long rectilinear blocked superdislocations after no‐load heating. The experimental results confirmed theoretical assumptions on the possibility of thermally activated transformations of superdislocations to indestructible barriers in the absence of external stresses.