Dendritic growth measurements in microgravity

Glicksman, M. E.; Koss, M. B.; Bushnell, L.T.; LaCombe, J. C.; Winsa, E.

doi:10.1007/bfb0102513

Cited by 5 publications

(4 citation statements)

References 5 publications

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“…Research under microgravity conditions in the last decades has shed light on the importance of fluid flow, and it has become clear that, even in the best experimental setups used on earth, residual flows can change the microstructure and thus hamper a detailed quantitative comparison with theoretical predictions. [1,2] The systematic analysis of convective effects is complicated, as there are many causes for fluid flow (natural convection, solidification shrinkage, stirring, pouring, etc.). When a metallic alloy is solidified, the most frequent morphology is the dendritic microstructure.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Fluid Flow on the Microstructure of Directionally Solidified AlSi-Base Alloys

Steinbach¹,

Ratke²

2007

Metall Mater Trans A

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To obtain a quantitative understanding of the effect of fluid flow on the microstructure of cast alloys, a technical Al-7 wt pct Si-0.6 wt pct Mg alloy (A357) has been directionally solidified with a medium temperature gradient under well-defined thermal and fluid-flow conditions. The solidification was studied in an aerogel-based furnace, which established flat isotherms and allowed the direct optical observation of the solidification process. A coil system around the sample induces a homogeneous rotating magnetic field (RMF) and, hence, a well-defined flow field close to the growing solid-liquid interface. The application of RMFs during directional solidification results in pronounced segregation effects: a change to pure eutectic solidification at the axis of the sample at high magnetic field strengths is observed. The investigations show that with increasing magnetic induction and, therefore, fluid flow, the primary dendrite spacing decreases, whereas the secondary dendrite arm spacing increases. An apparent flow effect on the eutectic spacing is observed.

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Section: Introductionmentioning

confidence: 99%

The Influence of Fluid Flow on the Microstructure of Directionally Solidified AlSi-Base Alloys

Steinbach¹,

Ratke²

2007

Metall Mater Trans A

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“…The most theoretical model for the solidification process is an accumulative process of mass and heat transference and is therefore influenced by flows caused by gravity. In recent decades, research under microgravity conditions has shed light on the significance of the fluid flow, which can typically have major impacts on the solidification structures, such as dendrite growth or grain refinement, transformation from equiaxed to globular microstructures, or macrosegregation [2][3]. In metallic cast alloys, the dendrite structure leads to nonuniform properties in the alloy that severely deteriorate its performance and suitability in many applications.…”

Section: Introductionmentioning

confidence: 99%

Influence of Rotating Magnetic Field (RMF) on Dendrite Growth, Mechanical and Elastic Properties of Sn-Cu-Co Lead-Free Solder Alloy

El-Taher,

Abd Elmoniem,

Mosaad

2023

Arab Journal of Nuclear Sciences and Applications

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Dendritic microstructures are a common issue in casting applications, leading to subpar mechanical properties. A new and innovative approach for combating this problem is through the application of mechanical stirring using an RMF. The solidification microstructures, mechanical and elastic characteristics of Sn-0.7wt%Cu-xCo (where x = 0.05 and 0.5) alloys were analyzed with and without the application of an RMF. The results revealed that, in the absence of an RMF, both solder alloys displayed extensive and undesirable columnar formations of the dendritic β-Sn phase. However, the application of an RMF led to a significant modification of the solidification microstructure, transforming the dendritic β-Sn phase from columnar to equiaxed, resulting in fragmentation of the dendrites. As well, the average size of (Cu,Co)6Sn5 IMCs was reduced, resulting in successful suppression of the growth rate of IMCs with the use of RMF. Tensile testing showed that the Sn-0.7wt%Cu-0.05Co alloy with RMF exhibited the highest strength across a range of temperatures and strain rates. Additionally, the ultimate tensile strength, yield strength, yield modulus, and elongation percentage of the Sn-Cu-0.05Co alloy with RMF were approximately 29.2%, 31.8%, 29.2% and 7.1% at 25°C higher compared to that of the RMF-free Sn-Cu-0.05Co alloy. By evaluating the Poisson's ratio, Young's modulus, shear modulus, and bulk modulus, it was determined with a high level of confidence that the application of RMF during solidification made the Sn-7Cu-0.5Co alloy more ductile, while the Sn-7Cu-0.05Co alloy demonstrated increased strength compared to their counterparts without RMF.

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“…inside a glassy matrix, is an attractive research field as growth mechanisms have been investigated in order to understand the kinetics, thermodynamic principles and the (an)isotropy of the respective materials, not only on earth, but even in the low gravity environment (mg) of space. 5,6 The growth directions of dendrites are closely related to the underlying crystal symmetry. 7 In recent years, it has been found that dendrite growth directions are not limited to a discrete set of crystallographic directions, but within certain limits may vary continuously.…”

Section: Introductionmentioning

confidence: 99%

Dendritic growth of yttrium aluminum garnet from an oxide melt in the system SiO2/Al2O3/Y2O3/CaO

2012

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Dendritic growth measurements in microgravity

Cited by 5 publications

References 5 publications

The Influence of Fluid Flow on the Microstructure of Directionally Solidified AlSi-Base Alloys

The Influence of Fluid Flow on the Microstructure of Directionally Solidified AlSi-Base Alloys

Influence of Rotating Magnetic Field (RMF) on Dendrite Growth, Mechanical and Elastic Properties of Sn-Cu-Co Lead-Free Solder Alloy

Dendritic growth of yttrium aluminum garnet from an oxide melt in the system SiO2/Al2O3/Y2O3/CaO

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