Effect of TiB2on univariant eutectic growth in a directionally solidified Al-alloy

Ebzeeva, Svetlana Emirovna; Nagels, Els; Froyen, Ludo

doi:10.1179/136404609x367362

Cited by 2 publications

(5 citation statements)

References 2 publications

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“…However, it may also be the influence of the microgravity. Ebzeeva [5], who performed mainly ground experiments under different compositions, found similar banded structures. Therefore, it is concluded that under microgravity conditions the banded structure is easier to be stabilized to form full band, so that more full bands can be formed in relatively shorter DS length.…”

Section: Resultsmentioning

confidence: 83%

“…The symbiotic growth was extensively studied under terrestrial conditions and the influence of growth velocity was discussed [2,3]. Nevertheless, the physics of the formation of particle bands in the multi-component alloy system are still not clear, e.g.…”

Section: Introductionmentioning

confidence: 99%

“…2 (1) c and (2) c). A probable reason is that the silicide particles were covered ahead of the growth direction with TiB 2 clusters that disturbed the diffusion field at the S/L IF and blocked the growth of silicide particles in the interface advancing direction [5]. More porosity appears on the smooth surface of particles in FM#3 samples than the GM sample, indicating that gas bubbles tend to segregate on the particle surface.…”

mentioning

confidence: 99%

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In Situ Particle Layer Formation in a Al-Mn-Si Ternary Eutectic Alloy: Ground Reference and Microgravity Experiments

Zhou

Froyen

2014

MSF

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A special type of divorced eutectic growth mode (symbiotic growth) in a ternary Al-Mn-Si alloy, triggered by addition of titanium boride (TiB2) has been studied under both ground and microgravity conditions. During directional solidification, α (AlMnSi) particles nucleate ahead of the planar solidification front and are pushed and later engulfed by the interface forming a banded particle layer structure. The presence of fine titanium boride particles (clusters) in front of the growing α (AlMnSi) particles makes the interaction between the intermetallic α (AlMnSi) particles and solidification front much more complex than most proposed models for particle/interface interactions. Microgravity experiments can eliminate the gravity related effects and thus provide an opportunity to better understand the formation mechanism of symbiotic growth. In this study, hypoeutectic Al-1Mn-3Si alloys with addition of 0.33 wt% TiB2 were directionally solidified in ESA Solidification and Quenching Furnace (SQF) on board of the International Space Station (ISS). The ground experiment was conducted in a replica of this furnace prior to the microgravity experiments. Non-destructive X-ray tomography and its 3D reconstruction software was used to characterize the particles and their distribution. Comparison between ground and microgravity experiment results is presented. The particle pushing and engulfment of symbiotic growth is discussed based on a particle pushing and engulfment model.

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Section: Resultsmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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In Situ Particle Layer Formation in a Al-Mn-Si Ternary Eutectic Alloy: Ground Reference and Microgravity Experiments

Zhou

Froyen

2014

MSF

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“…The Mn intermetallics form not only small cubes (cubic) structures but also complicated and large (reaching above 1000 µm) structures influencing the alloys properties. The cubic morphology is compatible with phases in [9] but for AlMn1Si3 modified with 0.17% diboride. Cubes where located in [9] in bands perpendicular to solidification direction for low solidification velocity and we have not observed such distributions at the process conditions used.…”

Section: Main Branch Of the Colonymentioning

confidence: 69%

“…The cubic morphology is compatible with phases in [9] but for AlMn1Si3 modified with 0.17% diboride. Cubes where located in [9] in bands perpendicular to solidification direction for low solidification velocity and we have not observed such distributions at the process conditions used.…”

Section: Main Branch Of the Colonymentioning

confidence: 69%

Three Dimensional Morphology of Mn Rich Intermetallics in AlSi Alloys Investigated with X-Ray Tomography

Mikołajczak

Ratke

2014

MSF

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Elementary Mn has a great importance as neutralizer of Fe intermetallics like β-Al5FeSi, which have detrimental effect on mechanical characteristics of AlSi alloys. Presence of Mn in AlSi alloys causes the formation of other intermetallic phases. To understand the effect of solidification conditions and fluid flow on the microstructure of AlSi-based alloys and the addition of Mn leading to Mn-based intermetallics, Al-5 wt pct Si 0.2/0.4/1.0 wt pct Mn alloys have been directionally solidified under defined thermal (gradient 3 K/mm, solidification velocity 0.02-0.12 mm/s) and fluid flow (rotating magnetic field 6 mT) conditions. The primary Al-phase and Mn-based intermetallic phases were studied using 3D X-ray tomography. The spatial morphology of primary phase and intermetallics were characterized with respect to different fluid flow and solidification conditions. The tomography has showed the 3D complicated structure of Mn phases developed.

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Effect of TiB₂on univariant eutectic growth in a directionally solidified Al-alloy

Cited by 2 publications

References 2 publications

<i>In Situ</i> Particle Layer Formation in a Al-Mn-Si Ternary Eutectic Alloy: Ground Reference and Microgravity Experiments

<i>In Situ</i> Particle Layer Formation in a Al-Mn-Si Ternary Eutectic Alloy: Ground Reference and Microgravity Experiments

Three Dimensional Morphology of Mn Rich Intermetallics in AlSi Alloys Investigated with X-Ray Tomography

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