Microstructural length scales in directionally solidified Sn-40 at.%Mn peritectic alloy containing intermetallic compounds

Peng, Peng; Su, Yanqing; Li, Xinzhong; Li, Jiangong; Guo, Jingjie; Fu, Hengzhi

doi:10.1016/j.intermet.2014.07.009

Cited by 13 publications

(3 citation statements)

References 33 publications

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“…In addition, it can be found from Fig. 1 that the driving force of peritectic transformation, namely, the compositional difference across peritectic β phase is quite small in Sn-Ni peritectic alloys due to the narrow range of compositions of peritectic Ni 3 Sn 4 phase 31 . So, the migration distance of primary/peritectic interface due to peritectic transformation should not be fast during isothermal annealing in this work.…”

Section: Discussionmentioning

confidence: 93%

“…As-cast rods of 3 mm in diameter and 110 mm in length were cut from the ingot. The experiments consisting of melting followed by directional solidification were carried out in a Bridgman-type system consisting of a resistance furnace, a water cooled liquid metal bath filled with liquid Ga–In–Sn alloy, which has been described in previous work 31 . Temperature profiles were measured separately using a PtRh30-PtRh6 thermocouple inserted within a fine alumina tube (0.6 mm in inner diameter) down to the center of the samples.…”

Section: Methodsmentioning

confidence: 99%

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On migration of primary/peritectic interface during interrupted directional solidification of Sn-Ni peritectic alloy

Peng

et al. 2016

Sci Rep

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The migration of the primary/peritectic interface in local isothermal condition is observed in dendritic structure of Sn–Ni peritectic alloy after experiencing interrupted directional solidification. It was observed that this migration of primary Ni3Sn2/peritectic Ni3Sn4 interface towards the primary Ni3Sn2 phase was accompanied by migration of liquid film located at this interface. The migration velocity of this interface was confirmed to be much faster than that of peritectic transformation, so this migration was mostly caused by superheating of primary Ni3Sn2 phase below TP, leading to nucleation and migration of liquid film at this interface. This migration can be classified as a kind of liquid film migration (LFM), and the migration velocity at the horizontal direction has been confirmed to be much faster than that along the direction of temperature gradient. Analytical prediction has shown that the migration of liquid film could be divided into two stages depending on whether primary phase exists below TP. If the isothermal annealing time is not long enough, both the liquid film and the primary/peritectic interface migrate towards the primary phase until the superheated primary phase has all been dissolved. Then, this migration process towards higher temperature is controlled by temperature gradient zone melting (TGZM).

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Section: Discussionmentioning

confidence: 93%

Section: Methodsmentioning

confidence: 99%

On migration of primary/peritectic interface during interrupted directional solidification of Sn-Ni peritectic alloy

Peng

et al. 2016

Sci Rep

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“…None of these oscillatory structures have been found in peritectic systems containing intermetallic compounds except that by Kohler et al 3 . For peritectic systems containing intermetallic compounds, as no steady-state solute redistribution of melt can be achieved 24 , some interesting microstructures which are distinct from that of solid solution phase can be obtained 24 25 26 . In addition, the dimensions of both the banded and band-like microstructures observed are close to the diameter of the sample.…”

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confidence: 99%

On oscillatory microstructure during cellular growth of directionally solidified Sn–36at.%Ni peritectic alloy

Peng

et al. 2016

Sci Rep

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An oscillatory microstructure has been observed during deep-cellular growth of directionally solidified Sn-36at.%Ni hyperperitectic alloy containing intermetallic compounds with narrow solubility range. This oscillatory microstructure with a dimension of tens of micrometers has been observed for the first time. The morphology of this wave-like oscillatory structure is similar to secondary dendrite arms, and can be observed only in some local positions of the sample. Through analysis such as successive sectioning of the sample, it can be concluded that this oscillatory microstructure is caused by oscillatory convection of the mushy zone during solidification. And the influence of convection on this oscillatory microstructure was characterized through comparison between experimental and calculations results on the wavelength. Besides, the change in morphology of this oscillatory microstructure has been proved to be caused by peritectic transformation during solidification. Furthermore, the melt concentration increases continuously during solidification of intermetallic compounds with narrow solubility range, which helps formation of this oscillatory microstructure.An important class of industrial alloys has been represented in peritectic systems, including Fe-Ni, Cu-Zn, Cu-Sn and Ti-Al which are the most widely known [1][2][3] . Solidification microstructures that form under steady state growth conditions have been reasonably well understood during peritectic solidification. However, under non-steady state growth conditions, the peritectic microstructures is also influenced by many other factors like Gibbs-Thomson effect 4 , and temperature gradient zone melting (TGZM) effect 5,6 etc. Besides, the selection of microstructures in peritectic systems is mostly governed by the coupling effects like convection, nucleation undercooling etc. 7,8 . Due to the above reasons, a wide variety of non-steady state microstructures have been revealed in directional solidification in both the hypoperitectic and hyperperitectic regions of peritectic systems [8][9][10][11][12][13][14] . Among them, the so-called banded 9 structures and the oscillatory structures 10,12 have been observed in several peritectic systems, including Sn-Cd, Pb-Bi, Fe-Ni alloys 1,3-11 . The former is featured by bands of both the primary and peritectic phases which form alternately normal to the growth direction 9 . And their formations have been attributed to nucleation followed by the growth of one phase (α or β ) ahead of a growing planar front of the other phase (β or α ). Besides, this banded structure is often related to the oscillatory structures 10,12 . In highly convective hyperperitectic alloys, tree-like structures which appeared as alternate bands and islands in longitudinal cross-sections have been revealed to be continuous structures in Pb-Bi and Sn-Cd alloys 13,14 . The oscillatory structures are, in fact, a continuous treelike morphology of the primary phase which is surrounded by the peritectic phase 12 . And these structures result from an...

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Composition-dependent phase substitution in directionally solidified Sn-22at.%Ni peritectic alloy

Peng

Yang

et al. 2015

J Mater Sci

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Microstructural length scales in directionally solidified Sn-40 at.%Mn peritectic alloy containing intermetallic compounds

Cited by 13 publications

References 33 publications

On migration of primary/peritectic interface during interrupted directional solidification of Sn-Ni peritectic alloy

On migration of primary/peritectic interface during interrupted directional solidification of Sn-Ni peritectic alloy

On oscillatory microstructure during cellular growth of directionally solidified Sn–36at.%Ni peritectic alloy

Composition-dependent phase substitution in directionally solidified Sn-22at.%Ni peritectic alloy

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