Gravity Influenced Convection in Al-Ni Melt

Mertinger, Valéria; Szabó, Gábor; Bárczy, Pál; Kovács, Árpád; Czél, György

doi:10.4028/www.scientific.net/msf.215-216.331

Cited by 5 publications

(4 citation statements)

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“…In the literature, a number of studies report the microstructural formation of Al-Ni alloys under conditions of steadystate growth from the melt. [1][2][3][4] Mertinger et al [2] have examined the effect of natural convection on the macrosegregation of a eutectic Al-Ni alloy during vertical and horizontal Bridgman growth. JuarezHernandez and Jones [3] have analyzed the solidification microstructure selection of primary Al 3 Ni and eutectic in five different hypereutectic alloys of the aAl-Al 3 Ni system that were directionally solidified by the Bridgman technique.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Development in Al-Ni Alloys Directionally Solidified under Unsteady-State Conditions

Canté

Spinelli

Ferreira

et al. 2008

Metall Mater Trans A

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Three Al-Ni hypoeutectic alloys were directionally solidified under upward unsteady-state heatflow conditions. Primary (k 1 ) and secondary (k 2 ) dendrite arm spacings were measured along the castings for all alloys and correlated with transient solidification thermal variables. A combined theoretical and experimental approach was used to quantitatively determine such thermal variables, i.e., transient metal/mold heat-transfer coefficients, tip growth rates, thermal gradients, tip cooling rates, and local solidification time. The article also focuses on the dependence of dendrite arm spacings on the alloy solute content. Furthermore, the experimental data concerning the solidification of Al-1.0, 2.5, and 4.7 wt pct Ni alloys are compared with the main predictive dendritic models from the literature.

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Section: Introductionmentioning

confidence: 99%

Microstructural Development in Al-Ni Alloys Directionally Solidified under Unsteady-State Conditions

Canté

Spinelli

Ferreira

et al. 2008

Metall Mater Trans A

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“…The local solidification time is given by the following expression [15]: (2) where X is the position in casting from the metal/mold interface, αS is the solid thermal diffusivity and S 0 , L 0 can be expressed as a function of the metal/mold heat transfer coefficient (h i ), and are given by [15]: Figure 1 shows the casting assembly used in the experiments. It can be seen that heat is directionally extracted only through a water-cooled bottom made of carbon steel (SAE 1020), promoting vertical upward directional solidification.…”

Section: Solidification Thermal Parametersmentioning

confidence: 99%

“…The literature reports a number of studies analyzing the microstructural formation of Al-Ni alloys under conditions of steady-state growth from the melt [1][2][3][4]. However, there is a lack of consistent studies and experimental reports on the microstructural development of Al-Ni alloys during transient heat flow conditions, which are of prime importance since this class of heat flow encompasses the majority of industrial solidification processes.…”

Section: Introductionmentioning

confidence: 99%

The correlation between dendritic microstructure and mechanical properties of directionally solidified hypoeutectic Al-Ni alloys

et al. 2010

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Al-Ni hypoeutectic alloys were directionally solidified under upward transient heat flow conditions. The aim of the present study is to set up correlations between the as-cast microstructure and the resulting mechanical properties of these alloys. The dependence of primary and secondary dendrite arm spacing on the alloy solute content and on solidification thermal parameters is also analyzed. The results include transient metal/mold heat transfer coefficient, tip growth rate, cooling rate, dendrite arm spacing, ultimate tensile strength, yield tensile strength and elongation. Expressions relating dendrite spacing to solidification thermal parameters and mechanical properties to the scale of the dendritic microstructure have been determined. It was found that the ultimate tensile strength and the yield tensile strength increase with increasing alloy solute content and with decreasing primary and secondary dendrite arm spacing. In contrast, the elongation was found to be independent of both alloy composition and dendritic arrangement.

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“…Most of the studies existing in the literature focussing the interrelation of microstructure and mechanical properties are based on samples which were grown in steady-state solidification set-ups [2][3][4][5][6]. This means that the examination of Al-Ni alloys solidified under unsteady-state heat flow conditions deserves particular attention since this class of solidification can better represent industrial conditions.…”

Section: Introductionmentioning

confidence: 99%

Correlation between dendrite arm spacing and microhardness during unsteady-state directional solidification of Al–Ni alloys

Silva

Araujo

Silva

et al. 2011

Philosophical Magazine Letters

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Hypoeutectic Al-Ni alloys are characterised by the formation of as-cast structures composed by a dendritic aluminium-rich matrix surrounded by a eutectic mixture ( þ ), where is the Al-rich phase and is the Al 3 Ni intermetallics. The morphology, size and distribution of the intermetallic particles decisively affect the mechanical properties of these alloys. This study aims to determine experimental laws relating the primary dendritic arm spacing ( 1 ) and Vickers microhardness (HV) of hypoeutectic Al-Ni alloys. Upward unidirectional solidification experiments were performed in order to obtain castings with significant differences in the scale of microstructural parameters along the casting length. It was found that the microhardness values were directly influenced by both the amount of solute and 1 and Hall-Petch-type equations relating the microindentation and 1 are proposed.

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Gravity Influenced Convection in Al-Ni Melt

Cited by 5 publications

References 0 publications

Microstructural Development in Al-Ni Alloys Directionally Solidified under Unsteady-State Conditions

Microstructural Development in Al-Ni Alloys Directionally Solidified under Unsteady-State Conditions

The correlation between dendritic microstructure and mechanical properties of directionally solidified hypoeutectic Al-Ni alloys

Correlation between dendrite arm spacing and microhardness during unsteady-state directional solidification of Al–Ni alloys

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