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Year 1999 No 3

Ďurišin J., Kyseľová K., Ďurišinová D.
ANALYSIS OF CARBON IN MOULDING POWDERS AND STEEL STRIPS
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No 3 (1999), p. 165-171
mag01_eng.txt (2 kB)  

Jandová J., Prošek T., Maixner J.
LEACHING OF ZINC OXIDE IN AQUEOUS SULPHURIC ACID SOLUTIONS
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No 3 (1999), p. 172-183
  mag02.pdf (226 kB)
mag02_eng.txt (931 B)  

Krakovská K., Remeteiová D.
TUNGSTEN ATOMIZER - STUDY OF ATOMIZATION REACTIONS OF SOME VOLATILE ANALYTES
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No 3 (1999), p. 184-194
  mag03.pdf (191 kB)
mag03_eng.txt (2 kB)  

Pokorný I.
NUMERICAL SOLUTION OF STRESSES IN THE ROLLING GAP - ONE-DIMENSIONAL CASE
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No 3 (1999), p. 195-201
  mag04.pdf (116 kB)
mag04_eng.txt (861 B)  

Varga A., Onuška D.
INFLUENCE OF ADDITIVE GRANULOMETRY ON DESULPHURIZATION PROCESS IN BOILERS WITH SUPERPOSED FLUIDIZED REACTOR
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No 3 (1999), p. 202-207
  mag05.pdf (160 kB)
mag05_eng.txt (2 kB)  

Havlík M., Vadász P., Fedor J.
APPLICATION OF STATISTIC MODEL OF IONIC MELTS ON ACTIVITY CALCULATION IN SYSTEM
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No 3 (1999), p. 208-212
mag06_eng.txt (799 B)  

Sinka V.
SEMI-SOLID METAL FORMING - RHEOLOGICAL CONCEPTS
Abstract
Until semi-solid metal forming has been introduced into industrial application most of the structural parts achieved their final form either in fully liquid or in fully solid state. The difficulties of forming in the temperature range between the solidus and the liquidus are ascribed to the formation of a solid skeleton of dendrites when the solid volume fraction achieves 20 per cent. This semi-solid material with a dendritic skeleton cannot be homogeneously deformed, since separation of the liquid phase and cracking may occur. On the other hand, by vigorous agitation of the cooling alloy the skeleton formation from dendrites is inhibited, since the solid phase grows in the form of globules instead of dendrites. Such a slurry (or mush) already can be homogeneously deformed. The deformation behaviour of semi-solid alloys, however, significantly differs from the deformation behaviour of both solid and liquid materials. These specific features of the deformation behaviour of the semi-solid materials are presented in this contribution.

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No 3 (1999), p. 213-218
  mag07.pdf (193 kB)
mag07_eng.txt (1 kB)