Exotic colony formation in Sn-Te eutectic system

Aramanda, Shanmukha Kiran; Salapaka, Sai Kiran; Khanna, Sumeet; Chattopadhyay, K.; Choudhury, Abhik

doi:10.1016/j.actamat.2020.07.036

Cited by 15 publications

(6 citation statements)

References 47 publications

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“…Depending on the growth conditions, instabilities can develop beyond a critical velocity leading to the formation of a two-phase colony. This phenomenon is very similar to the Mullins–Sekerka instability that occurs in single-phase solidification and is reported in the literature. ,, At velocities greater than 1 μm/s, the eutectic front, in the present case, gets destabilized, which causes the formation of these colonies.…”

Section: Resultssupporting

confidence: 89%

“…This phenomenon is very similar to the Mullins−Sekerka instability 48 that occurs in single-phase solidification and is reported in the literature. 46,49,50 At velocities greater than 1 μm/s, the eutectic front, in the present case, gets destabilized, which causes the formation of these colonies.…”

Section: Resultsmentioning

confidence: 60%

“…The temperature gradient at the melting point of the eutectic is calculated using the axial temperature plot and is 23.4 K/mm. More details about the apparatus are given in refs and . We have varied the solidification rates by changing the apparatus’ traverse rate relative to the stationary sample using a gearbox coupled with a linear drive.…”

Section: Methodsmentioning

confidence: 99%

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Anisotropy of Microstructure and Its Influence on Thermoelectricity: The Case of Cu₂Te–Sb₂Te₃ Eutectic

Mukherjee

Aramanda

Legese,

et al. 2021

ACS Appl. Energy Mater.

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Using a set of controlled in situ grown lamellar composites of (Cu2Te)62.02–(Sb2Te3)37.98, we report a remarkable variation of transport properties of thermoelectricity not only as a function of microstructural length scale but also as a function of direction-dependent arrangement of the phases and hence their interfaces. A quantitative evaluation of the microstructure along the transverse and the longitudinal directions of growth, imposed by the temperature gradient and growth rate in a unidirectional solidification setup, has been carried out. The microstructure is quantified through image analysis using fast Fourier transforms as well as a cluster base connectivity model and is further correlated with the thermoelectric transport properties. A marked anisotropy of properties as a function of measurement direction in the microstructural landscape could be observed. A maximum power factor of ∼1.4 mW m–1 K–2 and a figure of merit of 0.29 could be obtained at 580 K along the transverse direction for the sample with the characteristic microstructural length scale of 2.41 μm. This has an implication in engineering a thermoelectric device in terms of engineering power factor and output power density. For a ΔT of 250 K, we report a difference of 0.4 W cm–2 in output power density between the transverse and the longitudinal directions that have an identical microstructural length scale of 2.41 μm.

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Section: Resultssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 60%

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Anisotropy of Microstructure and Its Influence on Thermoelectricity: The Case of Cu₂Te–Sb₂Te₃ Eutectic

Mukherjee

Aramanda

Legese,

et al. 2021

ACS Appl. Energy Mater.

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“…5(c)) by performing a fast Fourier transform (FFT) on these transverse cross-sections, see Fig. S3 [27]. Peaks in the FFT are diffuse and resemble a circular ring, from which we calculate the radial distribution function and derive the eutectic spacing.…”

Section: Analysis Of Pseudo-4d Datamentioning

confidence: 99%

“…The 3D structure of eutectic cells has been debated since the 1960s [3,24,25] and continues to present day [26,27,28]. A confounding issue is that investigators lacked suitable (i.e., 3D space-and time-resolved) measurements on the growth dynamics of eutectic colonies, as will be elaborated on below.…”

Section: Introductionmentioning

confidence: 99%

Pseudo-4D view of the growth and form of locked eutectic colonies

Chao,

Lindemann,

Shahani

2022

Preprint

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We investigate solidification of an Al-Al 2 Cu as a model system to understand the emergence of patterns (such as lamellar, rod and maze-like) within eutectic colonies. To uncover the morphological transitions in-situ and in 3D, we introduce here a new synchrotron-based, X-ray imaging procedure. Our method simultaneously maximizes the temporal (200 ms) and spatial resolution (0.69 2 µm 2 /pixel) over that of traditional imaging approaches. The wealth of information obtained from this procedure enables us to visualize the development of a crystallographically 'locked' eutectic microstructure in the presence of thermosolutal convection. This data provides direct insight into the mechanism of the lamella-to-rod transition as the eutectic accommodates fluctuations in interfacial composition and growth velocity. We find that this transition is brought about by impurity-driven forces acting on the solid-solid-liquid trijunction that must overcome the stiffness of the solid-solid interfaces.Our pseudo-4D imaging strategy holds broad appeal to the solidification science community, as it can overcome the space-time trade-off in conventional in situ X-ray microtomography.

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Unveiling the Intricacies of a Ductile‐Phase Toughened Intermetallic: An In‐Depth Exploration of a Eutectic Mo–Si–Ti Alloy and its Mechanical Behavior

Vikram,

Aramanda,

Schliephake

et al. 2024

Adv Eng Mater

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In this work, we present the development of directional solidification for a novel high‐temperature Mo‐20Si‐52.8Ti (at. %) ternary alloy using a modified Bridgeman type apparatus. The resulting alloy exhibits a microstructure consisting of a body‐centered cubic solid solution BCCss and a hexagonal silicide (Ti,Mo)5Si3 with approximate volume fractions of 50% for each phase. The phases exhibit a crystallographic orientation relationship with and . Different solidification velocities were imposed which revealed an inverse relationship to the lamellar spacing according to a Jackson‐Hunt type scaling. Mechanical characterization using Vickers indentation demonstrated that the BCCss accommodates plasticity through dislocation mediation, while the silicide phase exhibits high hardness and brittleness, serving as a crack initiation site. Crack propagation was arrested and deflected at the interface to the BCCss. Fracture toughness measurements via indentation yield a fracture toughness of 3.7 MPa√m for the silicide, somewhat higher than previously reported values for Si‐ and Cr‐based intermetallics. The directionally solidified (DS) specimens showed an enhanced fracture toughness attributed to a greater BCCss length scale; thus, combining the ductile and hard phases resulted in a ductile‐phase toughened intermetallic composite. The findings open up new possibilities for the design of advanced intermetallic composites with improved toughness performance.This article is protected by copyright. All rights reserved.

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Exotic colony formation in Sn-Te eutectic system

Cited by 15 publications

References 47 publications

Anisotropy of Microstructure and Its Influence on Thermoelectricity: The Case of Cu₂Te–Sb₂Te₃ Eutectic

Anisotropy of Microstructure and Its Influence on Thermoelectricity: The Case of Cu₂Te–Sb₂Te₃ Eutectic

Pseudo-4D view of the growth and form of locked eutectic colonies

Unveiling the Intricacies of a Ductile‐Phase Toughened Intermetallic: An In‐Depth Exploration of a Eutectic Mo–Si–Ti Alloy and its Mechanical Behavior

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Exotic colony formation in Sn-Te eutectic system

Cited by 15 publications

References 47 publications

Anisotropy of Microstructure and Its Influence on Thermoelectricity: The Case of Cu2Te–Sb2Te3 Eutectic

Anisotropy of Microstructure and Its Influence on Thermoelectricity: The Case of Cu2Te–Sb2Te3 Eutectic

Pseudo-4D view of the growth and form of locked eutectic colonies

Unveiling the Intricacies of a Ductile‐Phase Toughened Intermetallic: An In‐Depth Exploration of a Eutectic Mo–Si–Ti Alloy and its Mechanical Behavior

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Anisotropy of Microstructure and Its Influence on Thermoelectricity: The Case of Cu₂Te–Sb₂Te₃ Eutectic

Anisotropy of Microstructure and Its Influence on Thermoelectricity: The Case of Cu₂Te–Sb₂Te₃ Eutectic