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Single-Crystal Growth of f-Electron Intermetallics in a Tetra-Arc Czochralski Furnace

100%

Szlawska M., Kaczorowski D.

Acta Physica Polonica A

2013

vol. 124

issue 2

336-339

The Czochralski technique has induced technological revolution in the electronic industry. It has also been widely used in the fundamental research area, as it allows obtaining high-quality single crystals of large variety of binary, ternary and multinary compounds. The unique tetra-arc Czochralski furnace installed at the Institute of Low Temperature and Structure Research, Polish Academy of Sciences in Wrocław, described in detail in the article, has been used to prepare a large number of single crystals of various Ce- and U-based intermetallic phases. Their excellent quality has facilitated advanced investigations of their anisotropic, often highly unusual physical properties.

Tool Steels: Forging Simulation and Microstructure Evolution of Large Scale Ingot

80%

Mengaroni S., Cianetti F., Calderini M., Evangelista E., Di Schino A., McQueen H.

Acta Physica Polonica A

2015

vol. 128

issue 4

629-632

The aim of this paper is to analyze the hot working behavior of two different steels based on 3% and 5% Cr steel chemistry, respectively. Hot deformation is studied by hot torsion tests in the range of temperatures 1000-1200°C and strain rates 0.01, 0.10, 1.00 s^{-1}. At given temperatures and strain rates flow curves exhibit a peak followed by a decline towards a steady state which is indicative of dynamic recrystallization. At constant strain, flow stress increases with increasing strain rate and decreasing temperature. The analysis of the constitutive equation relating peak flow stress, strain rate and temperature shows high activation energy values for both steels. Recrystallized volume fraction of steels after hot deformation is estimated based on the grain orientation spread as measured by electron backscattered diffraction technique, on the hot deformed and quenched materials.

THz Reflection Spectra of Different Materials, Including Explosives, Measured at a Distance up to 5 m

70%

Walczakowski M., Palka N., Czerwiński A., Sypek M., Szustakowski M.

Acta Physica Polonica A

2015

vol. 127

issue 3

689-692

This work presents a terahertz system designed for the reflection spectroscopy of different materials located at a distance up to 5 m. The source of the radiation is a tunable solid-state optical parametric oscillator, which generates a narrow-band nanosecond pulses in the range of 0.7-2.5 THz. The signal is detected with relatively fast and having big sensitivity hot electron bolometer. The detailed description of each device and the functioning of the experimental setup are provided as well as the methodology of the measurement is explained. Investigations were performed in the 0.7-2.2 THz range in free space with relative humidity of about 40%. The experiment was divided into three series, each of which was carried out with different distance between the examined sample and the system - 1 m, 3 m, and 5 m. Obtained spectra of selected materials, including explosives, are similar to the results received from a purged time domain spectroscopy system. The observed small deviations are connected with fluctuations of the laser wavelength and the instability of the bolometer.

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3 Acta Physica Polonica A

2 2015

1 2013

1 Calderini M.

1 Cianetti F.

1 Czerwiński A.

1 Di Schino A.

1 Evangelista E.

1 Kaczorowski D.

1 McQueen H.

1 Mengaroni S.

1 Palka N.

1 Sypek M.

1 Szlawska M.

1 Szustakowski M.

1 Walczakowski M.

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Single-Crystal Growth of f-Electron Intermetallics in a Tetra-Arc Czochralski Furnace

Tool Steels: Forging Simulation and Microstructure Evolution of Large Scale Ingot

THz Reflection Spectra of Different Materials, Including Explosives, Measured at a Distance up to 5 m