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On the Influence of the Crystallization Conditions on the Microstructure of the Directionally Solidified Eutectic of the LiF – LiYF 4 System
Author(s) -
Barta Č.,
Fendrych F.,
Recker K.,
Tříska A.,
Wallrafen F.
Publication year - 1991
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170260409
Subject(s) - eutectic system , microstructure , crystallization , materials science , directional solidification , hexagonal crystal system , matrix (chemical analysis) , degree (music) , chemical engineering , crystallography , chemistry , composite material , physics , engineering , acoustics
This paper particularly deals with the transitions in degree and type of ordering of a given microstructure. As a model system the eutectic of the LiF – LiYF 4 system was used for studies of transitions from ‘anomal’ microtextures with non‐cooperative production of seeds of both phases to the fibrous microtexture. It was shown that even if the matrix phase LiYF 4 contains a relative high volume ratio (36%) of LiF it is possible to create highly ordered fibrous microtextures with pronounced hexagonal ordering of particular LiF fibres. It was also shown that methods of image processing could be used for sensitive evaluation of small changes in degree of ordering of the microstructure. These procedures make possible a deeper understanding of the influence of the solidification conditions on the microstructure of the directionally solidified eutectic and creates possibilities for optimalisation of the technological process.