Abstract
The system aluminium-nickel is of importance as a model-system in materials science as well as a basic system for superalloys in technical applications. The knowledge of the thermophysical properties of the system aluminium-nickel has been limited to the areas close to the pure elements mainly related to the high melting temperatures of up to 1638 C. The viscosity, which is one of these thermophysical properties, depends on alloy composition as well as on temperature. The viscosity is of importance as an input parameter in computer simulations and for improving casting processes of metallic alloys. The viscosity of aluminium-nickel melts has been measured only once so far. However, not the whole concentration range of the aluminium-nickel system was covered by these data. In particular the viscosity values of the high melting alloys, which are of technological interest, were unknown. The measurement of the missing values was not possible due to the high melting temperatures using existing viscometers. A new oscillating cup viscometer has been constructed within this work. The viscometer has been tested measuring the viscosity values of pure metals, which are well known in literature. The test measurements have been done at temperatures up to 1800 C. A temperature of
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Citation Formats
Kehr, Mirko.
Construction of a high-temperature viscosimeter and measurement of the viscosity of melts of the system aluminium-nickel; Aufbau eines Hochtemperaturviskosimeters und Messung der Viskositaet von Schmelzen des Systems Aluminium-Nickel.
Germany: N. p.,
2009.
Web.
Kehr, Mirko.
Construction of a high-temperature viscosimeter and measurement of the viscosity of melts of the system aluminium-nickel; Aufbau eines Hochtemperaturviskosimeters und Messung der Viskositaet von Schmelzen des Systems Aluminium-Nickel.
Germany.
Kehr, Mirko.
2009.
"Construction of a high-temperature viscosimeter and measurement of the viscosity of melts of the system aluminium-nickel; Aufbau eines Hochtemperaturviskosimeters und Messung der Viskositaet von Schmelzen des Systems Aluminium-Nickel."
Germany.
@misc{etde_21342303,
title = {Construction of a high-temperature viscosimeter and measurement of the viscosity of melts of the system aluminium-nickel; Aufbau eines Hochtemperaturviskosimeters und Messung der Viskositaet von Schmelzen des Systems Aluminium-Nickel}
author = {Kehr, Mirko}
abstractNote = {The system aluminium-nickel is of importance as a model-system in materials science as well as a basic system for superalloys in technical applications. The knowledge of the thermophysical properties of the system aluminium-nickel has been limited to the areas close to the pure elements mainly related to the high melting temperatures of up to 1638 C. The viscosity, which is one of these thermophysical properties, depends on alloy composition as well as on temperature. The viscosity is of importance as an input parameter in computer simulations and for improving casting processes of metallic alloys. The viscosity of aluminium-nickel melts has been measured only once so far. However, not the whole concentration range of the aluminium-nickel system was covered by these data. In particular the viscosity values of the high melting alloys, which are of technological interest, were unknown. The measurement of the missing values was not possible due to the high melting temperatures using existing viscometers. A new oscillating cup viscometer has been constructed within this work. The viscometer has been tested measuring the viscosity values of pure metals, which are well known in literature. The test measurements have been done at temperatures up to 1800 C. A temperature of 2300 C is achievable with slight modifications. A new software for controlling the device and evaluation of the measured data has been developed. Several working equations for calculating the viscosity have been implemented. Furthermore a new approach has been used for detecting the damping of the oscillation of the pendulum containing the liquid sample. The viscosity of aluminium-nickel melts have been measured successfully. The measured values are in good agreement with the little number of known values. A good agreement with values calculated from diffusion experiments and computer simulations was observed as well. Several models for calculating the viscosity of liquid alloys have been tested and compared with the experimental values measured in this work. Not all the tested models can predict the viscosity values of aluminium-nickel melts plausibly. (orig.)}
place = {Germany}
year = {2009}
month = {Oct}
}
title = {Construction of a high-temperature viscosimeter and measurement of the viscosity of melts of the system aluminium-nickel; Aufbau eines Hochtemperaturviskosimeters und Messung der Viskositaet von Schmelzen des Systems Aluminium-Nickel}
author = {Kehr, Mirko}
abstractNote = {The system aluminium-nickel is of importance as a model-system in materials science as well as a basic system for superalloys in technical applications. The knowledge of the thermophysical properties of the system aluminium-nickel has been limited to the areas close to the pure elements mainly related to the high melting temperatures of up to 1638 C. The viscosity, which is one of these thermophysical properties, depends on alloy composition as well as on temperature. The viscosity is of importance as an input parameter in computer simulations and for improving casting processes of metallic alloys. The viscosity of aluminium-nickel melts has been measured only once so far. However, not the whole concentration range of the aluminium-nickel system was covered by these data. In particular the viscosity values of the high melting alloys, which are of technological interest, were unknown. The measurement of the missing values was not possible due to the high melting temperatures using existing viscometers. A new oscillating cup viscometer has been constructed within this work. The viscometer has been tested measuring the viscosity values of pure metals, which are well known in literature. The test measurements have been done at temperatures up to 1800 C. A temperature of 2300 C is achievable with slight modifications. A new software for controlling the device and evaluation of the measured data has been developed. Several working equations for calculating the viscosity have been implemented. Furthermore a new approach has been used for detecting the damping of the oscillation of the pendulum containing the liquid sample. The viscosity of aluminium-nickel melts have been measured successfully. The measured values are in good agreement with the little number of known values. A good agreement with values calculated from diffusion experiments and computer simulations was observed as well. Several models for calculating the viscosity of liquid alloys have been tested and compared with the experimental values measured in this work. Not all the tested models can predict the viscosity values of aluminium-nickel melts plausibly. (orig.)}
place = {Germany}
year = {2009}
month = {Oct}
}