Interdendritic eutectic solidification of an AlSi-7.0 alloy under microgravity

Tensi, H. M.; Rösch, R.

doi:10.1007/bf02657891

Cited by 1 publication

(2 citation statements)

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“…Present data are shown as black circles and are offset horizontally within the estimated error range of v -1/4 ⋅ G -1/2 , to ease visibility of error bars. Regression lines correspond to: (i) metallic systems where ρ solute /ρ solvent ≠ 1 (Al-Cu [65,70,72,73,77], Al-Ni [54,74], Al-Si [75,80,83], Al-Li [78], Bi-Mn [84,85], Cu-Mn [79,82], and (ii) non-metallic systems where ρ solute /ρ solvent ≈ 1 (SCN-Camphor [66] and SCN-Acetone [82]. Shaded regions about each regression line represent 95% confidence intervals.…”

Section: Discussionmentioning

confidence: 99%

“…Binary alloy solidification data under diffusion-controlled (i.e., microgravity) environments are typically in good agreement with theoretical models describing λ 1 . Conversely, systems that are influenced strongly by gravity-induced convection show large deviations from theoretical models when solidified under terrestrial conditions[72,73]. Increased values of in alloys such as Al-Cu [67, 72, 74, 75] and Al-Ni [56, 76] is well documented in the literature and attributed to gravity-driven convective effects during solidification [56, 67, 72, 74-81].…”

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Directional solidification of aqueous TiO2 suspensions under reduced gravity

et al. 2017

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Porous materials exhibiting aligned, elongated pore structures can be created by directional solidification of aqueous suspensions-where particles are rejected from a propagating ice front and form interdendritic, particle-packed walls-followed by sublimation of the ice and sintering of the particle walls. Theoretical models that predict dendritic lamellae spacing-and thus wall and pore width in the final materials-are currently limited due to an inability to account for gravitydriven convective effects during solidification. Here, aqueous suspensions of 10-30 nm TiO 2 nanoparticles are solidified on parabolic flights under micro-, lunar, and Martian gravity and compared to terrestrially-solidified samples. After ice sublimation and sintering, all resulting TiO 2 materials exhibit elongated lamellar pores replicating the ice dendrites. Increasing the TiO 2 fraction in the suspensions leads to decreased lamellar spacing in all samples, regardless of gravitational acceleration. Consistent with previous studies of microgravity solidification of binary metallic alloys, lamellar spacing decreases with increasing gravitational acceleration. Mean lamellar spacing for 20 wt.% TiO 2 nanoparticles suspensions under micro-, lunar, Martian, and terrestrial gravity are, respectively: 50±8, 34±11, 30±6, and 23±9 μm, indicating that gravity-driven convection strongly affects lamellae spacing under terrestrial gravity conditions. Gravitational effects on lamellar spacing are highest at low TiO 2 fractions in the suspension; for 5 wt.% TiO 2

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