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eutectic structures

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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 More
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 More
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 More
Image
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 More
Image
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 More
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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× More
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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× More
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 More
Image
Published: 27 April 2016
Fig. 4 Crystalline structures on cooling in a eutectic phase diagram More
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...
Book Chapter

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...
Image
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 More
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 More
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...
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...
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 More
Image
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 More
Image
Published: 01 January 2003
Fig. 9 Representative microstructure of a 95Zn-Al coating, showing lamellar-shaped and rod-shaped eutectic structure More
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...
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...