Production of Al-(12?25) wt% Si alloys by rapid solidification: melt spinning versus centrifugal atomization

Todeschini, Patrick; Champier, G.; Samuel, F. H.

doi:10.1007/bf01151831

Cited by 27 publications

(9 citation statements)

References 11 publications

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“…We expect that the thermocapillary force driven pore elimination mechanism revealed here could open avenues for developing approaches to achieve pore-free 3D printing to unleash the full potential of 3D printing technologies. The thermocapillary force driven pore elimination mechanism also has implications for a broad range of research and engineering fields where pore evolution is important and a temperature gradient exists, such as laser polishing 24 , laser cladding 25 , welding 26 , melt spinning 27 , reactions in nuclear reactors 28 , and chemical reactors 29 .…”

Section: Resultsmentioning

confidence: 99%

Pore elimination mechanisms during 3D printing of metals

et al. 2019

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Laser powder bed fusion (LPBF) is a 3D printing technology that can print metal parts with complex geometries without the design constraints of traditional manufacturing routes. However, the parts printed by LPBF normally contain many more pores than those made by conventional methods, which severely deteriorates their properties. Here, by combining in-situ high-speed high-resolution synchrotron x-ray imaging experiments and multi-physics modeling, we unveil the dynamics and mechanisms of pore motion and elimination in the LPBF process. We find that the high thermocapillary force, induced by the high temperature gradient in the laser interaction region, can rapidly eliminate pores from the melt pool during the LPBF process. The thermocapillary force driven pore elimination mechanism revealed here may guide the development of 3D printing approaches to achieve pore-free 3D printing of metals.

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Section: Resultsmentioning

confidence: 99%

Pore elimination mechanisms during 3D printing of metals

et al. 2019

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“…This result implies that under the equilibrium conditions, a hypereutectic Al-16 wt.%Si alloy can have a hypoeutectic structure due to the exposure of undercooling through rapid quenching. This effect has been previously identified in Al-Si alloys [9,23].…”

Section: Resultsmentioning

confidence: 69%

Hardness and microstructural characteristics of rapidly solidified Al–8–16 wt.%Si alloys

Uzun

Karaaslan

Göğebakan

et al. 2004

Journal of Alloys and Compounds

109

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“…This can be attributed to a very rapidly moving solidification front which reduces partitioning and leads to extensive solute trapping [10]. The main characteristic feature of this structure is the homogeneous distribution of Si within the grains [11]. As shown in Fig.…”

Section: Resultsmentioning

confidence: 96%

Microstructural evolution of Al-20Si-5Fe alloy during rapid solidification and hot consolidation

et al. 2009

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Al-20Si-5Fe melt was rapidly solidified into particles and ribbons and then consolidated to near full density by hot pressing at 400°C/250 MPa/1 h. According to the eutectic-growth and dendritic-growth velocity models, the solidification front velocity and the amount of undercooling were estimated for the particles with different sizes. Values of 0.43-1.2 cm/s and 15-28 K were obtained. The secondary dendrite arm spacing revealed a cooling rate of 6 × 10 5 K/s for the particles with an average size of 20 μm. Solidification models for the ribbons yielded a cooling rate of 5 × 10 7 K/s. As a result of the higher cooling rate, the melt-spun ribbons exhibited considerable microstructural refinement and modification. The size of the primary silicon decreased from approximately 1 μm to 30 nm while the formation of iron-containing intermetallic compounds was suppressed. Supersaturation of the aluminum matrix in an amount of ~7 at.% Si was noticed from the XRD patterns. During the hot consolidation process, coarsening of the primary silicon particles and precipitation of β-Al 5 FeSi phase were observed. Evaluation of the compressive strength and hardness of the alloy indicated an improvement in mechanical properties due to the microstructural modification.

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Production of Al-(12?25) wt% Si alloys by rapid solidification: melt spinning versus centrifugal atomization

Cited by 27 publications

References 11 publications

Pore elimination mechanisms during 3D printing of metals

Pore elimination mechanisms during 3D printing of metals

Hardness and microstructural characteristics of rapidly solidified Al–8–16 wt.%Si alloys

Microstructural evolution of Al-20Si-5Fe alloy during rapid solidification and hot consolidation

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