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dendritic microstructure

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Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003727
EISBN: 978-1-62708-177-1
...Abstract Abstract The most common aluminum alloy systems are aluminum-silicon, aluminum-copper, and aluminum-magnesium. This article focuses on the grain structure, eutectic microstructure, and dendritic microstructure of these systems. It provides information on microsegregation and its...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005210
EISBN: 978-1-62708-187-0
... to control the columnar and equiaxed microstructures. The formation of cellular and dendritic structures in one- and two-phase structures is presented with emphasis on the effect of processing conditions and composition on the selection of microstructure and microstructure scales. microsegregation...
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 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...
Series: ASM Handbook
Volume: 1A
Publisher: ASM International
Published: 31 August 2017
DOI: 10.31399/asm.hb.v01a.a0006314
EISBN: 978-1-62708-179-5
... include the dendrite growth models and the cooperative eutectic growth models. The article provides some solutions using numerical models to simulate the kinetics of microstructure formation in cast iron. It concludes with a discussion on cellular automaton (CA) technique that can handle complex topology...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005406
EISBN: 978-1-62708-196-2
... the microstructure of the growing phases (i.e., 10 −7 –10 −4 m, e.g., dendritic or eutectic patterns) and the grain structure (i.e., 10 −4 –10 −2 m, e.g., equiaxed and columnar grains). This article concentrates on these intermediate length scales, where transport phenomena govern the spatial and temporal...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005236
EISBN: 978-1-62708-187-0
... level (10 −10 –10 −9 m) to the casting dimensions, i.e. the macroscopic scale, (10 −2 –1 m). Intermediate length scales are used to define the microstructure of the growing phases (i.e., 10 −7 –10 −4 m, e.g., dendritic or eutectic patterns) and the grain structure (i.e., 10 −4 –10 −2 m, e.g...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003781
EISBN: 978-1-62708-177-1
..., and tin, which are present in the microstructure of zinc alloys. The article also provides information on microexamination that helps to determine the dendrite arm spacing, as well as the grain size, grain boundaries, and grain counts. aluminum cadmium copper dendrite arm spacing etching grain...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003790
EISBN: 978-1-62708-177-1
... casting methods, the microstructure of products manufactured using semisolid metalworking is not dendritic. During processing, the dendritic structure is broken up and evolves into a spheroidal structure. The mechanical properties of the spheroidal microstructure is superior to those found in castings...
Series: ASM Handbook
Volume: 1A
Publisher: ASM International
Published: 31 August 2017
DOI: 10.31399/asm.hb.v01a.a0006343
EISBN: 978-1-62708-179-5
... of the eutectic phase (right side). See the article “Metallography and Microstructures of Cast Iron” in this Volume for the color version. Source: Ref 15 A recent investigation by Diószegi et al. ( Ref 18 ) demonstrated the role of the investigated surface size when the austenite dendrite area fraction...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005215
EISBN: 978-1-62708-187-0
...-Cr superalloy MICROSEGREGATION is the nonuniform distribution of alloying elements within a volume characteristic of the solidification microstructure, that is, chemical nonuniformity that can be observed and measured on the scale of the dendrite spacing and/or the grain size. The cored...
Series: ASM Handbook
Volume: 1A
Publisher: ASM International
Published: 31 August 2017
DOI: 10.31399/asm.hb.v01a.a0006351
EISBN: 978-1-62708-179-5
... for both: 200×. Color etching with aqueous 10% sodium metabisulfite reveals the segregation and dendritic nature of this grade much better than the standard etchants. See the article “Metallography and Microstructures of Cast Iron” in this Volume for more detail on color metallography. Figure 2...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005218
EISBN: 978-1-62708-187-0
... of columnar and equiaxed dendritic microstructures ( Ref 24 ). In addition to the characteristics of the source, access to a high-resolution, fast-readout, low-noise charge-coupled device camera specially designed for time-resolved studies ( Ref 25 ) was critical to the outcome of the experiments. Successive...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005522
EISBN: 978-1-62708-197-9
... process installs a polycrystalline grain structure in the material ( Fig. 1d ). In each grain, the growth front reorganizes itself into a diversity of microstructures rather than evolving evenly in space and smoothly in time. The most prevalent solidification microstructures exhibit a dendritic morphology...
Series: ASM Handbook
Volume: 2A
Publisher: ASM International
Published: 30 November 2018
DOI: 10.31399/asm.hb.v02a.a0006498
EISBN: 978-1-62708-207-5
... metal has the type of globular microstructure shown in Fig. 1(b) , rather than a more typical dendritic structure ( Fig. 1a ), the semisolid material behaved essentially as a viscous liquid and could be processed to produce high-quality components. Fig. 1 Comparison of (a) dendritic...
Series: ASM Handbook
Volume: 10
Publisher: ASM International
Published: 15 December 2019
DOI: 10.31399/asm.hb.v10.a0006684
EISBN: 978-1-62708-213-6
... °F), holding for 10 min, and water quenching. The specimen was etched using Kroll’s reagent, and Nomarski DIC revealed the microstructure more effectively than bright field. The dendritic microstructure of a sand-cast Cu-4%Sn binary alloy tint-etched using Beraha’s PbS reagent for copper-base alloys...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005525
EISBN: 978-1-62708-197-9
... different than a bundle of parallel tubes, because real dendritic microstructures are not evenly spaced and have side branches that vary in size. However, the simplicity of Eq 25 , with a very easily determined dependence on microstructural data, has made it a very popular choice for treating mushy zone...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005501
EISBN: 978-1-62708-197-9
... (UNS A92219) with a cooling rate of 0.065 K/s. The microstructure of the solidified samples is dendritic. The calculated fraction of solid versus temperature relationship for this quaternary alloy is shown in Fig. 1 . According to the Scheil model, the solidification sequence for this alloy is liquid...
Series: ASM Handbook
Volume: 24
Publisher: ASM International
Published: 15 June 2020
DOI: 10.31399/asm.hb.v24.a0006573
EISBN: 978-1-62708-290-7
... microstructures of a Co-Cr-Mo alloy fabricated by selective laser melting (SLM) and a cast alloy ( Ref 26 ). The cast material shows a grain-oriented dendritic microstructure where the alloying elements are segregated at the dendritic arms ( Ref 27 ). However, the SLM-fabricated part shows a highly textured...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005234
EISBN: 978-1-62708-187-0
... zone occur near the liquidus temperature at high liquid fractions. Also, the geometry for which it is used is much different than a bundle of parallel tubes, because real dendritic microstructures are not evenly spaced and have side branches that vary in size. Several studies extended permeability...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003729
EISBN: 978-1-62708-177-1
... output of microstructure evolution of eutectic spheroidal graphite iron during solidification. (a) Solidification fraction ( f s ) = 0.24. (b) f s = 0.55. (c) f s = 0.72. (d) f s = 0.99. Length of each square = 200 μm. Source: Ref 17 Fig. 10 Simulated dendritic growth morphology...