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ON THE EVOLUTION OF QUASI-PERIODICITY THROUGH FAULTING - A PROJECTION FORMALISM APPROACH

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Title ON THE EVOLUTION OF QUASI-PERIODICITY THROUGH FAULTING - A PROJECTION FORMALISM APPROACH
 
Creator KULKARNI, UD
BANERJEE, S
KULKARNI, SD
 
Subject resolution electron-microscopy
two-dimensional quasicrystal
rotational symmetry
quasi-periodicity
tial alloys
al-mn
phase
crystalline
model
diffraction
 
Description Attention is focussed on a certain class of crystalline structures wherein the atomic arrangements can be described in terms of periodic arrangements of tiles of two different types-squares and rhombi. Such structures can be regarded as rather simple (unmodulated) approximants of various two-dimensional quasiperiodic structures. Some of the metallic phases which belong to this class are the beta-Mn and the sigma phases which are so related to the octagonal and the dodecagonal quasicrystals respectively, as also certain Al-Ti intermetallic phases which are derivatives of a quasiperiodic superlattice structure. It is well established that some of these phases can transform into their quasiperiodic counterparts in a continuous manner. Application of the method of projection from higher dimensions to such continuous transformations shows that the transformation to quasiperiodicity initiates through the formation of faults (antiphase boundaries in the case of superlattice structures) in the unmodulated structures.
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2011-08-25T18:24:52Z
2011-12-26T12:57:10Z
2011-12-27T05:47:03Z
2011-08-25T18:24:52Z
2011-12-26T12:57:10Z
2011-12-27T05:47:03Z
1993
 
Type Article
 
Identifier ACTA METALLURGICA ET MATERIALIA, 41(4), 1283-1292
0956-7151
http://dx.doi.org/10.1016/0956-7151(93)90179-V
http://dspace.library.iitb.ac.in/xmlui/handle/10054/11107
http://hdl.handle.net/10054/11107
 
Language en