Premium
Dislocation and Crowdion Plasticity of Corundum at Room Temperature
Author(s) -
Rozhanskii V. N.,
Nazarova M. P.,
Svetlov I. L.,
Kalashnikova L. K.
Publication year - 1970
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.19700410212
Subject(s) - corundum , burgers vector , dislocation , ion , impression , deformation (meteorology) , crystal (programming language) , materials science , crystallography , dipole , single crystal , condensed matter physics , chemistry , physics , composite material , computer science , organic chemistry , world wide web , programming language
During concentrated load deformation of corundum basal plates at room temperature dislocations are formed near the impression in (0001), {1120}, and {1211} planes. However, these dislocations near the impression are not numerous. Thus the formation of an impression of the indenter cannot be ensured by such dislocations. In this case, according to Indenbom's hypothesis Reported at the Conference on Deformation Strengthening of Crystals, held in Kharkov, October 13 to 16, 1969. , the substance from under the indenter can be outflowed by dynamic crowdions. The deformation of a crystal is essentially accomplished at the expense of origination of dynamic crowdions running in the 〈1100〉 directions in which oxygen ions are close packed. As a result this region of the crystal is enriched by interstitial oxygen ions. During heating of the crystal a coagulation of interstitial ions takes place and a great number of dipoles and loops appears around the impression in (0001) and {1100} planes. The Burgers vector of the loops is \documentclass{article}\pagestyle{empty}\begin{document}$ b = \frac{a}{3}\left\langle {1\bar 10\frac{c}{a}} \right\rangle $\end{document} .