Thermophysical properties of the TiAl-2Cr-2Nb alloy in the liquid phase measured with an electromagnetic levitation device on board the International Space Station, ISS-EML

Abstract Thermophysical properties of the γ-TiAl alloy Ti-48Al-2Cr-2Ni in the liquid phase were investigated with a containerless electromagnetic processing device on board the International Space Station. Containerless processing is warranted by the high liquidus temperature T liq = 1 776 K and the high dissolution reactivity in the liquid phase. Thermophysical properties investigated include the surface tension and viscosity, density, specific heat capacity and the electrical resistivity. The experiments were supported by magnetohydrodynamic fluid flow calculations. The Ti-48Al-2Cr-2Ni alloy could be stably processed over extended times in the stable and undercooled liquid phase and exhibited an exceptional degree of undercooling before solidification. Experimental processes and thermophysical properties so obtained will be described. The experiments demonstrate the broad experimental capabilities of the electromagnetic processing facility on the International Space Station for thermophysical investigations in the liquid phase of metallic alloys not achievable by other methods.

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Thermophysical properties of a Si50Ge50 melt measured on board the International Space Station

npj Microgravity ◽

10.1038/s41526-020-0100-5 ◽

2020 ◽

Vol 6 (1) ◽

Author(s):

Yuansu Luo ◽

Bernd Damaschke ◽

Georg Lohöfer ◽

Konrad Samwer

Keyword(s):

International Space Station ◽

Thermophysical Properties ◽

Space Station ◽

International Space

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Demonstration of the effect of stirring on nucleation from experiments on the International Space Station using the ISS-EML facility

npj Microgravity ◽

10.1038/s41526-021-00161-9 ◽

2021 ◽

Vol 7 (1) ◽

Author(s):

A. K. Gangopadhyay ◽

M. E. Sellers ◽

G. P. Bracker ◽

D. Holland-Moritz ◽

D. C. Van Hoesen ◽

...

Keyword(s):

Fluid Flow ◽

International Space Station ◽

Space Station ◽

Electromagnetic Levitation ◽

Variable Density ◽

Crystal Nucleation ◽

Microgravity Environment ◽

International Space ◽

Glass Forming ◽

Flux Model

AbstractThe effect of fluid flow on crystal nucleation in supercooled liquids is not well understood. The variable density and temperature gradients in the liquid make it difficult to study this under terrestrial gravity conditions. Nucleation experiments were therefore made in a microgravity environment using the Electromagnetic Levitation Facility on the International Space Station on a bulk glass-forming Zr57Cu15.4Ni12.6Al10Nb5 (Vit106), as well as Cu50Zr50 and the quasicrystal-forming Ti39.5Zr39.5Ni21 liquids. The maximum supercooling temperatures for each alloy were measured as a function of controlled stirring by applying various combinations of radio-frequency positioner and heater voltages to the water-cooled copper coils. The flow patterns were simulated from the known parameters for the coil and the levitated samples. The maximum nucleation temperatures increased systematically with increased fluid flow in the liquids for Vit106, but stayed nearly unchanged for the other two. These results are consistent with the predictions from the Coupled-Flux model for nucleation.

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Thermophysical Properties of Advanced Ni‐Based Superalloys in the Liquid State Measured on Board the International Space Station

Advanced Engineering Materials ◽

10.1002/adem.201901228 ◽

2019 ◽

Vol 22 (4) ◽

pp. 1901228 ◽

Cited By ~ 3

Author(s):

Markus Mohr ◽

Rainer Wunderlich ◽

Yue Dong ◽

David Furrer ◽

Hans-Jörg Fecht

Keyword(s):

International Space Station ◽

Thermophysical Properties ◽

Liquid State ◽

Space Station ◽

International Space

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Precise Measurements of Thermophysical Properties of Liquid Ti–6Al–4V (Ti64) Alloy On Board the International Space Station

Advanced Engineering Materials ◽

10.1002/adem.202000169 ◽

2020 ◽

Vol 22 (7) ◽

pp. 2000169 ◽

Cited By ~ 3

Author(s):

Markus Mohr ◽

Rainer Wunderlich ◽

Rada Novakovic ◽

Enrica Ricci ◽

Hans-Jörg Fecht

Keyword(s):

International Space Station ◽

Thermophysical Properties ◽

Space Station ◽

International Space ◽

Ti64 Alloy

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Density of molten gadolinium oxide measured with the electrostatic levitation furnace in the International Space Station

High Temperatures-High Pressures ◽

10.32908/hthp.v49.835 ◽

2020 ◽

Vol 49 (1-2) ◽

pp. 5-15

Author(s):

TAKEHIKO ISHIKAWA ◽

CHIHIRO KOYAMA ◽

HIDEKI SARUWATARI ◽

HARUKA TAMARU ◽

HIROHISA ODA ◽

...

Keyword(s):

Liquid Phase ◽

Semiconductor Lasers ◽

International Space Station ◽

Space Station ◽

Gadolinium Oxide ◽

Microgravity Environment ◽

Electrostatic Levitation ◽

International Space ◽

Power Semiconductor ◽

Spherical Sample

Density of gadolinium oxide in its liquid phase was measured using a containerless technique under microgravity environment in the International Space Station (ISS). An electrostatically levitated sample was melted using high power semiconductor lasers. Pictures of a molten spherical sample were analyzed and corresponding volumes were obtained as afunction of temperature. After weighing the returned sample mass, the density of the Gd2O3 was found to be 7240 kg/m3 at its melting temperature (Tm = 2693 K).

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