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The Electron Microscopic Observation of Mechanical Twins in Gadolinium
Author(s) -
Kumar J.,
Srivastava O. N.
Publication year - 1969
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19690320140
Subject(s) - crystal twinning , gadolinium , electron microscope , dislocation , materials science , electron , electron diffraction , diffraction , mechanism (biology) , crystallography , scanning electron microscope , condensed matter physics , chemistry , microstructure , physics , composite material , optics , metallurgy , nuclear physics , quantum mechanics
Mechanical twinning in gadolinium has been observed using an electron microscope. The analysis of electron diffraction patterns revealed that the twinning elements are K 1 = K 2 = (10 1 2) and η 1 = η 2 = [10 1 1]. The possible mechanism of genesis for these twins are investigated. It is found that the twins are nucleated due to thermal stresses set up in the films as a result of electron irradiation. There is no evidence for the pole dislocation mechanism to be operative in the present case, instead, the observations suggest that the twin formation is in accordance with the Bell‐Cahn mechanism.