Growth directions in directionally solidified Al–Zn and Zn–Al alloys near eutectic composition

Rhême, Martin; Gonzales, F.; Rappaz, M.

doi:10.1016/j.scriptamat.2008.04.017

Cited by 30 publications

(11 citation statements)

References 13 publications

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“…[6], this high departure from cubic symmetry crystals must induce a very different growth kinetics of dendrite arms growing along [ ]. Considering the case of hexagonal symmetry crystals (e.g., Mg [21] or Zn [22]), it is believed that the alignment of the primary phase dendritic structure seen in Fig. 1a must be the result of [1 0 0]-[0 1 0] dendrites growing much faster than [0 0 1] dendrites.…”

Section: Discussionmentioning

confidence: 99%

Effects of Ni additions, trace elements and solidification kinetics on microstructure formation in Sn–0.7Cu solder

et al. 2011

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Three binary Sn-Cu solder alloys of near-eutectic composition have been directionally solidified at different growth rates. The competition between primary tetragonal Sn cells/dendrites and eutectic is interpreted with the coupled zone concept. It is also found that SnCu is a weakly irregular eutectic system with Cu 6 Sn 5 leading the eutectic, but two different eutectic morphologies (coarse and fine) form simultaneously during eutectic growth. At higher growth rates, the eutectic interface breaks down into a cellular eutectic with the fine eutectic in the centre of the cells and the coarse one at the cell boundaries. This is explained by the segregation of Pb impurities ahead of the eutectic interface.

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Section: Discussionmentioning

confidence: 99%

Effects of Ni additions, trace elements and solidification kinetics on microstructure formation in Sn–0.7Cu solder

et al. 2011

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“…Zinc-aluminum alloys constitute an important class of wrought alloys, which are widely used as anti-corrosion coatings of steel sheets [1]. To meet the increasing demand for high-performance and high-quality die castings, a class of zinc-based engineering cast alloys has been developed, particularly for applications in the automotive industry.…”

Section: Introductionmentioning

confidence: 99%

“…Owing to its good anti-corrosive and forming properties as well as good technical performances, the coating attracts wide interest and has been put into industrial production rapidly [3]. As for the Zn-Al alloy, previous works have been done mainly focusing on directionally solidified eutectic composition, dendritic growth [1,[4][5][6][7], and mechanical properties and corrosion properties [2,[7][8].…”

Section: Introductionmentioning

confidence: 99%

Directional solidification and physical properties measurements of the zinc-aluminum eutectic alloy

Engin

Böyük

Kaya

et al. 2011

Int J Miner Metall Mater

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Zn-5wt% Al eutectic alloy was directionally solidified with different growth rates (5.32-250.0 µm/s) at a constant temperature gradient of 8.50 K/mm using a Bridgman-type growth apparatus. The values of eutectic spacing were measured from transverse sections of the samples. The dependences of the eutectic spacing and undercooling on growth rate are determined as λ=9.21V −0.53 and ΔT=0.0245V 0.53 , respectively. The results obtained in this work were compared with the Jackson-Hunt eutectic theory and the similar experimental results in the literature. Microhardness of directionally solidified samples was also measured by using a microhardness test device. The dependency of the microhardness on growth rate is found as Hv=115.64V 0.13 . Afterwards, the electrical resistivity (r) of the casting alloy changes from 40×10 −9 to 108×10 −9 Ω·m with the temperature rising in the range of 300-630 K. The enthalpy of fusion (ΔH) and specific heat (C p ) for the Zn-Al eutectic alloy are calculated to be 113.37 J/g and 0.309 J/(g·K), respectively by means of differential scanning calorimetry (DSC) from heating trace during the transformation from liquid to solid.

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“…Hexagonal close-packed zinc is characterized by large solid-liquid interfacial energy anisotropy [24,25] and magnetocrystalline anisotropy [13,14]. Therefore, it is of fundamental interest to study its growth under HMFs.…”

Section: Introductionmentioning

confidence: 99%

Morphological and Crystallographic Characterization of Primary Zinc-Rich Crystals in a Ternary Sn-Zn-Bi Alloy under a High Magnetic Field

Ban

Zhang

et al. 2017

Crystals

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Due to the unique capacity for structural control, high magnetic fields (HMFs) have been widely applied to the solidification process of alloys. In zinc-based alloys, the primary zinc-rich crystals can be dendritic or needle-like in two dimensions. For the dendritic crystals, their growth pattern and orientation behaviors under HMFs have been investigated. However, the three-dimensional crystallographic growth pattern and the orientation behaviors of the needle-like primary zinc-rich crystals under a high magnetic field have not been studied. In this work, a ternary Sn-Zn-Bi alloy was solidified under different HMFs. The above-mentioned two aspects of the needle-like primary zinc-rich crystals were characterized using the Electron Backscattered Diffraction (EBSD) technique. The results show that the primary zinc-rich crystals are characterized by the plate-shaped faceted growth in three dimensions. They grow in the following manner: spreading rapidly in the {0001} basal plane with a gradual decrease in thickness at the edges. The application of HMFs has no effect on the growth form of the primary zinc-rich crystals, but induces their vertical alignment. Crystallographic analysis indicates that the vertically aligned primary zinc-rich crystals orient preferentially with the c-axis perpendicular to the direction of the magnetic field.

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Growth directions in directionally solidified Al–Zn and Zn–Al alloys near eutectic composition

Cited by 30 publications

References 13 publications

Effects of Ni additions, trace elements and solidification kinetics on microstructure formation in Sn–0.7Cu solder

Effects of Ni additions, trace elements and solidification kinetics on microstructure formation in Sn–0.7Cu solder

Directional solidification and physical properties measurements of the zinc-aluminum eutectic alloy

Morphological and Crystallographic Characterization of Primary Zinc-Rich Crystals in a Ternary Sn-Zn-Bi Alloy under a High Magnetic Field

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