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Freezing in Halide Salts

100%

Akdere Ű., Yilmaz M., Kavanoz H., Taşseven Ç.

Acta Physica Polonica A

2008

vol. 113

issue 6

1659-1670

The static criterion that the amplitude of the principal peak of the liquid structure factor has a constant value along the freezing line and the onset of freezing are studied from the structure factors and the static dielectric functions of halide salts interacting via the effective pair potentials through the hypernetted-chain approximation. It is observed that the criterion above is restricted to the effective charge difference. The critical value of plasma parameter at freezing is affected by the mobility and number concentration of anions and cations. The distribution of the value of the static dielectric function closest to the wave number axis in the negative region is also determined by the charge difference and the ordering of ions and related to the onset of freezing.

Study of Two-Dimensional Melting in a System of Small Magnets

80%

Šviková M., Liščinský M., Rabatin P., Géci M.

vol. 126

issue 1

258-259

Using video tracking we study configurational and melting properties of a finite number (64) of 6 mm sized disc magnets moving on an air layer produced by an air table to imitate two-dimensional (2D) crystal. It is shown that velocity of air flow allows us to influence temperature. Analysing trajectories of particles has shown the transition from hexagonal to square lattice and after it to liquid phase with underlying square shell structure.

Metallurgical Characterization of Hot Tearing Curves Recorded during Solidification of Magnesium Alloys

70%

Huang Y., Wang Z., Srinivasan A., Kainer K., Hort N.

Acta Physica Polonica A

2012

vol. 122

issue 3

497-500

This work investigates the hot tearing behavior of Mg-Al and Mg-Zn alloys quantitatively based on the measurement of contraction force using an experimental setup which was developed at MagIC. An emphasis is given on the analysis of typical hot tearing curves to understand the corresponding metallurgical phenomena shown by these curves. The recorded hot tearing curves, i.e. the contraction force vs. temperature or time, contain valuable metallurgical information. They give not only the precise temperature at which the hot tearing initiates, but also depict information about the propagation of hot cracks. Combined with thermodynamic calculations, the critical solid fraction corresponding to the occurrence of hot tearing can be calculated. Further microstructural observations were performed. Several phenomena such as the crack propagation and refilling of cracks, which influence the slope of hot tearing curves, are also discussed.

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3 Acta Physica Polonica A

1 2014

1 2012

1 2008

1 Akdere Ű.

1 Géci M.

1 Hort N.

1 Huang Y.

1 Kainer K.

1 Kavanoz H.

1 Liščinský M.

1 Rabatin P.

1 Srinivasan A.

1 Taşseven Ç.

1 Wang Z.

1 Yilmaz M.

1 Šviková M.

Search results

Freezing in Halide Salts

Study of Two-Dimensional Melting in a System of Small Magnets

Metallurgical Characterization of Hot Tearing Curves Recorded during Solidification of Magnesium Alloys