TitleEutectic Structures Competition in the Stripes Strengthening the (Zn) – Single Crystal
Journal titleArchives of Foundry Engineering
KeywordsEutectic structure selection ; (Zn) – single crystal ; Branching phenomenon
Divisions of PASNauki Techniczne
Archives of Foundry Engineering continues the publishing activity started by Foundry Commission of the Polish Academy of Sciences (PAN) in Katowice in 1978. The initiator of it was the first Chairman Professor Dr Eng. Wacław Sakwa – Corresponding Member of PAN, Honorary Doctor of Czestochowa University of Technology and Silesian University of Technology. This periodical first name was „Solidification of Metals and Alloys” , and made possible to publish the results of works achieved in the field of the Basic Problems Research Cooperation. The subject of publications was related to the title of the periodical and concerned widely understand problems of metals and alloys crystallization in a casting mold. In 1978-2000 the 44 issues have been published. Since 2001 the Foundry Commission has had patronage of the annually published “Archives of Foundry” and since 2007 quarterly published “Archives of Foundry Engineering”. Thematic scope includes scientific issues of foundry industry:
- Theoretical Aspects of Casting Processes,
- Innovative Foundry Technologies and Materials,
- Foundry Processes Computer Aiding,
- Mechanization, Automation and Robotics in Foundry,
- Transport Systems in Foundry,
- Castings Quality Management,
- Environmental Protection.
Some eutectic stripes have been generated in a hexagonal (Zn) - single crystal. The stripes are situated periodically with the constant interstripes
spacing. The eutectic structure in the stripes consists of strengthening inter-metallic compound, Zn16Ti, and (Zn) – solid solution.
The rod-like irregular eutectic structure (with branches) appears at low growth rates. The regular lamellar eutectic structure is observed at
middle growth rates. The regular rod-like eutectic structure exists exclusively in the stripes at some elevated growth rates. A new
thermodynamic criterion is recommended. It suggests that this eutectic regular structure is the winner in a morphological competition for
which the minimum entropy production is lower. A competition between the regular rod-like and the regular lamellar eutectic growth is
described by means of the proposed criterion. The formation of branches within irregular eutectic structure is referred to the state of
marginal stability. A continuous transitions from the marginal stability to the stationary state are confirmed by the continuous
transformations of the irregular eutectic structure into the regular one.
PublisherThe Katowice Branch of the Polish Academy of Sciences
TypeArtykuły / Articles