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eutectic structures
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Image
Published: 01 December 2008
Fig. 3 Schematic of the four broad categories of regular eutectic structures. (a) Regular rodlike (volume fraction, V F , <30%; entropy of fusion, α, <2). (b) Regular lamellar ( V F > 30% and α < 2). (c) Faceted rods or spherical ( V F < 30% and α > 2). (d) Faceted
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Image
Published: 01 December 2008
Fig. 4 General classification of eutectic structures as a function of the entropy of fusion (Δ S F ) and the volume fraction ( V F ). There are six regions of classification based on the morphology of the eutectics. These are typical microstructures corresponding to the six regions: 1, Pb
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Image
Published: 01 December 2008
Fig. 5 Classification of eutectic structures into six distinct regions as a function of entropy of fusion (Δ S F ) and volume fraction ( V F ). The structures obtained were for a growth rate of 5 × 10 −4 cm·s −1 (2 × 10 −4 in·s −1 ). Structures left of the vertical line at 5.5 cal·mol −1
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Published: 01 December 2008
Fig. 7 Typical halos found in eutectic structures. (a) Ag-36 wt% Cu showing primary copper (black) with silver halo. (b) Al-35 wt% Cu showing eutectic radiating from primary CuAl 2 . Source: Ref 3
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Published: 15 June 2020
Fig. 22 Microstructure of banded structures in eutectic structure. Source: Ref 45 . Reproduced from G.Y. Ma, S. Yan, F.Y. Niu, Y.L. Zhang, and D.J. Wu, Microstructure and Mechanical Properties of Solid Al 2 O 3 -ZrO 2 (Y 2 O 3 ) Eutectics Prepared by Laser Engineered Net Shaping, J. Laser
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Image
Published: 01 January 2002
Fig. 65 Section showing comparatively coarse eutectic structure and (dark) platelike constituents. Etched in 20% H 2 SO 4 at 70 °C (160 °F) at 134×
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Image
Published: 30 August 2021
Fig. 44 Section showing comparatively coarse eutectic structure and (dark) platelike constituents. Etched in 20% H 2 SO 4 at 70 °C (160 °F). Original magnification: 134×
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Image
Published: 15 December 2019
Fig. 55 Microstructure of as-cast Cu-8.4%P eutectic structure of alpha copper and Cu 3 P etched using KBI reagent (100 mL water, 3 g ammonium persulfate, and 1 mL ammonium hydroxide) and viewed using (a) bright field, (b) dark field, and (c) Nomarski DIC. In dark field, all copper-phosphide
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Image
Published: 27 April 2016
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005211
EISBN: 978-1-62708-187-0
... Abstract This article presents the binary eutectic phase diagram to understand the various structures that evolve in a binary eutectic system during solidification. It describes the various classifications and solidification principles of the eutectic structures. The formation of halos...
Abstract
This article presents the binary eutectic phase diagram to understand the various structures that evolve in a binary eutectic system during solidification. It describes the various classifications and solidification principles of the eutectic structures. The formation of halos in eutectic microstructures of most alloy systems is also discussed.
Book Chapter
Book: Alloy Phase Diagrams
Series: ASM Handbook
Volume: 3
Publisher: ASM International
Published: 27 April 2016
DOI: 10.31399/asm.hb.v03.a0006225
EISBN: 978-1-62708-163-4
... Abstract This article begins with a schematic illustration of a eutectic system in which the two components of the system have the same crystal structure. Eutectic systems form when alloying additions cause a lowering of the liquidus lines from both melting points of the pure elements...
Abstract
This article begins with a schematic illustration of a eutectic system in which the two components of the system have the same crystal structure. Eutectic systems form when alloying additions cause a lowering of the liquidus lines from both melting points of the pure elements. The article describes the aluminum-silicon eutectic system and the lead-tin eutectic system. It discusses eutectic morphologies in terms of lamellar and fibrous eutectics, regular and irregular eutectics, and the interpretation of eutectic microstructures. The article examines the solidification of a binary alloy of exactly eutectic composition. It concludes with a discussion on terminal solid solutions.
Image
in Physical Metallurgy Concepts in Interpretation of Microstructures
> Metallography and Microstructures
Published: 01 December 2004
Fig. 11 Schematic binary phase diagram illustrating the effect of cooling rate on an alloy lying outside the equilibrium eutectic transformation line. Rapid solidification from S x to a metastable position (S*) can result in some eutectic structure being formed, because the last liquid
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Image
Published: 01 December 1998
Fig. 21 Binary phase diagram, illustrating the effect of cooling rate on an alloy lying outside the equilibrium eutectic-transformation line. Rapid solidification into a terminal phase field can result in some eutectic structure being formed; homogenization at temperatures in the single-phase
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Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005212
EISBN: 978-1-62708-187-0
...), as well as the temperature of the aluminum-silicon eutectic plateau, is cooling-rate dependent. Primary silicon undercools more than primary aluminum; hence, the eutectic structure forms at 10 to 12 °C (18 to 22 °F) below the eutectic temperature without appreciable recalescence ( Ref 10 ). Consequently...
Abstract
This article illustrates the equilibrium phase diagram for an aluminum-silicon system, showing the metastable extensions of liquidus and solidus lines. It describes the classification and microstructure of the aluminum-silicon eutectic. The article presents the theories of solidification and chemical modification of the aluminum-silicon eutectic.
Series: ASM Handbook
Volume: 24
Publisher: ASM International
Published: 15 June 2020
DOI: 10.31399/asm.hb.v24.a0006559
EISBN: 978-1-62708-290-7
... the centimeter level. However, the Bridgeman method has some limitations, such as low-temperature gradient and coarse eutectic structure ( Ref 10 ). Although the nondirectional solidification methods can achieve preparation of larger-sized materials, these methods often require expensive high-temperature...
Abstract
Directed-energy deposition (DED) is a kind of additive manufacturing (AM) technology based on synchronous powder feeding or wire feeding. This article provides a comprehensive coverage of DED for ceramic AM, beginning with an overview of DED equipment setup, followed by a discussion on DED materials and the DED deposition process. The bulk of the article is devoted to the discussion on the microstructure and properties of oxide ceramics, namely alumina and zirconia ceramics.
Image
Published: 27 April 2016
Fig. 22 Coupled zones (shaded regions) on eutectic phase diagrams. The coupled zones represent the interface temperature (solidification rate) dependent composition region in which a completely eutectic structure is obtained. (a) Nearly symmetrical coupled zone in regular eutectic. (b) Skewed
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in Formation of Microstructures, Grain Textures, and Defects during Solidification
> Metals Process Simulation
Published: 01 November 2010
) into the interdendritic liquid of the mushy zone, and (S3) growth of the extradendritic eutectic structure (region 3). Source: Ref 10
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Image
Published: 01 January 2003
Fig. 9 Representative microstructure of a 95Zn-Al coating, showing lamellar-shaped and rod-shaped eutectic structure
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Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005518
EISBN: 978-1-62708-197-9
... Abstract This article reviews the various aspects of the simulation of solidification microstructures and grain textures. It describes the grain structures and morphology of dendrites or eutectics that compose the internal structure of the grains. A particular emphasis has been put...
Abstract
This article reviews the various aspects of the simulation of solidification microstructures and grain textures. It describes the grain structures and morphology of dendrites or eutectics that compose the internal structure of the grains. A particular emphasis has been put on the simulation of defects related to grain textures and microstructures. The article provides information on the application of the most important simulation approaches and the status of numerical simulation.
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005213
EISBN: 978-1-62708-187-0
... Abstract Cast iron exhibits a considerable amount of eutectic in the solid state. This article discusses the structure of liquid iron-carbon alloys to understand the mechanism of the solidification of cast iron. It illustrates the nucleation of the austenite-flake graphite eutectic, austenite...
Abstract
Cast iron exhibits a considerable amount of eutectic in the solid state. This article discusses the structure of liquid iron-carbon alloys to understand the mechanism of the solidification of cast iron. It illustrates the nucleation of the austenite-flake graphite eutectic, austenite-spheroidal graphite eutectic, and austenite-iron carbide eutectic. The article provides a discussion on primary austenite and primary graphite. It also describes the growth of eutectic in cast iron in terms of isothermal solidification, directional solidification, and multidirectional solidification.
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