Modelling of Al-7%wtSi-1wt%Fe Ternary Alloy: Application to Space Experiments with a Rotating Magnetic Field

2014 ◽  
Vol 790-791 ◽  
pp. 46-51 ◽  
Author(s):  
Olga Budenkova ◽  
Florin Baltaretu ◽  
Sonja Steinbach ◽  
Lorenz Ratke ◽  
András Roósz ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Materials Science ◽  
Primary Dendrite ◽  
Space Station ◽  
Rotating Magnetic Field ◽  
Electromagnetic Stirring ◽  
International Space ◽  
Secondary Dendrite Arm Spacing ◽  
Dendrite Arm Spacing ◽  
Space Experiments

Recently several experiments on directional solidification of Al-6.5wt.Si-0.93wt.%Fe (AlSi7Fe1) alloy were performed under terrestrial conditions and onboard the International Space Station (ISS) in the Materials Science Lab (MSL) with use of electromagnetic stirring and without it. Analysis of the samples showed that stirring with a rotating magnetic field lead to the accumulation of iron-rich intermetallics in the center of the sample and influenced the primary dendrite spacing while the secondary dendrite arm spacing were not affected. In the present paper the accumulation of the intermetallics b-Al5SiFe in the center of the samples due to RMF stirring is demonstrated numerically and the evolution of primary and secondary dendrite arm spacing is discussed.

Effect of a Rotating Magnetic Field on the Solidified Structure of Al-Si Alloys

2006 ◽  
Vol 508 ◽  
pp. 263-268 ◽  
Author(s):  
Jenő Kovác ◽  
András Roósz ◽  
János Szőke
Keyword(s):  
Magnetic Field ◽  
Steady State ◽  
Microstructure Evolution ◽  
Research Work ◽  
Unidirectional Solidification ◽  
Rotating Magnetic Field ◽  
Electromagnetic Stirring ◽  
Convective Conditions ◽  
Microstructure Formation ◽  
Secondary Dendrite Arm Spacing

The aim of our research work is to study the microstructure formation during casting of technical alloys under diffusive and magnetically controlled convective conditions on earth and in space. Unidirectional solidification experiments under steady-state conditions were performed with Al-Si binary alloys containing three different amounts of Si, using electromagnetic stirring of the melt. The influence of the rotating magnetic field on the microstructure evolution (particularly on the secondary dendrite arm spacing) as compared to experiments without stirring was studied.

scholarly journals Fractal Nature of Advanced Ni-Based Superalloys Solidified on Board the International Space Station

2021 ◽  
Vol 13 (9) ◽  
pp. 1724
Author(s):  
Vojislav Mitić ◽  
Cristina Serpa ◽  
Ivana Ilić ◽  
Markus Mohr ◽  
Hans-Jörg Fecht
Keyword(s):  
International Space Station ◽  
Fractal Analysis ◽  
Power Plants ◽  
Materials Science ◽  
Structural Characteristics ◽  
Turbine Blades ◽  
Space Station ◽  
Casting Process ◽  
Cross Sectional ◽  
International Space

Materials science is highly significant in space program investigation, energy production and others. Therefore, designing, improving and predicting advanced material properties is a crucial necessity. The high temperature creep and corrosion resistance of Ni-based superalloys makes them important materials for turbine blades in aircraft engines and land-based power plants. The investment casting process of turbine blades is costly and time consuming, which makes process simulations a necessity. These simulations require fundamental models for the microstructure formation. In this paper, we present advanced analytical techniques in describing the microstructures obtained experimentally and analyzed on different sample’s cross-sectional images. The samples have been processed on board the International Space Station using the MSL-EML device based on electromagnetic levitation principles. We applied several aspects of fractal analysis and obtained important results regarding fractals and Hausdorff dimensions related to the surface and structural characteristics of CMSX-10 samples. Using scanning electron microscopy (SEM), Zeiss LEO 1550, we analyzed the microstructure of samples solidified in space and successfully performed the fractal reconstruction of the sample’s morphology. We extended the fractal analysis on the microscopic images based on samples solidified on earth and established new frontiers on the advanced structures prediction.

Primary dendrite array morphology in Al-7 wt% Si alloy samples directionally solidified aboard the International Space Station

2021 ◽  
Vol 562 ◽  
pp. 126077
Author(s):  
Masoud Ghods ◽  
Supriya R. Upadhyay ◽  
Ravi S. Rajamure ◽  
Surendra N. Tewari ◽  
Richard N. Grugel ◽  
...  
Keyword(s):  
International Space Station ◽  
Primary Dendrite ◽  
Space Station ◽  
Directionally Solidified ◽  
International Space

First Experiments Using the Materials Science Laboratory on Board the International Space Station

2011 ◽  
Vol 23 (3) ◽  
pp. 345-353 ◽  
Author(s):  
Thorsten Enz ◽  
Sonja Steinbach ◽  
Dejan Simicic ◽  
Galina Kasperovich ◽  
Lorenz Ratke
Keyword(s):  
International Space Station ◽  
Materials Science ◽  
Space Station ◽  
Science Laboratory ◽  
International Space

scholarly journals 3-D modeling and simulation of crystal growth of GE₀.₉₈ Si₀.₀₂ under the influence of various gravity levels, G-jitter and rotating magnetic field using traveling solvent method

2021 ◽  
Author(s):  
Mehdi Mohammadi Shemirani
Keyword(s):  
Magnetic Field ◽  
Space Station ◽  
Three Dimensional ◽  
Rotating Magnetic Field ◽  
Growth Interface ◽  
Solvent Method ◽  
Buoyancy Convection ◽  
Terrestrial Condition ◽  
Flow Heat ◽  
Micro Gravity

A three-dimensional numerical simulation was conducted to study the effect of a rotating magnetic (RMF) field on the fluid flow, heat transfer and mass transfer in the presence of various gravity levels by utilizing the traveling solvent method (TSM). The presence of the RMF suppressed the buoyancy convection in the GE₀.₉₈ Si₀.₀₂ solution zone in order to get homogeneity with a flat growth interface. It was found that the intensity of the flow at the centre of the crucible decreased at a faster rate compared to the flow near the walls when increasing magnetic field intensity is combined with a certain rotational speed. This behavior created a stable and uniform silicon distribution in the horizontal plane near the growth interface in the terrestrial condition. Different magnetic field intensities for different rotational speeds were examined in both terrestrial and micro-gravity conditions. The effects of residual acceleration, known as G-jitter, on board the International Space Station and European Space Orbiter were also investigated.

Effect of Calcium and Strontium on Microstructure of AZ31 Wrought Magnesium Alloys

2011 ◽  
Vol 686 ◽  
pp. 30-39
Author(s):  
Zhuang Qing Zhu ◽  
Fu Sheng Pan ◽  
Chong Zhao ◽  
Yao Bo Hu
Keyword(s):  
Intermetallic Compound ◽  
Primary Dendrite ◽  
Dendrite Spacing ◽  
X Ray Diffraction ◽  
Cast State ◽  
Secondary Dendrite Arm Spacing ◽  
X Ray ◽  
Dendrite Arm Spacing ◽  
Primary Dendrite Spacing ◽  
Ternary Intermetallic Compound

AZ31 wrought alloys at as-cast state with different microcontent calcium and strontium was studied by optical microscopy, X-ray diffraction, scanning electron microscopy and energy dispersive X-ray analysis. The study shows that the primary dendrite spacing and the secondary dendrite arm spacing can be refined significantly by Ca or Sr element. At 0.5wt.% Sr and 1.8wt.% Ca, the best refinement effect is fulfilled, its primary dendrite spacing and secondary dendrite arm spacing decreased from 292μm to 87μm. The Al4Sr intermetallic compound is observed at grain boundaries When Sr was added. The Al4Sr disappears after Ca added, a new ternary intermetallic compound (Mg, Al)2Ca presents. The addition of Sr and Ca can cause microhardness increasing.

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