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homogeneous phase

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420041
EISBN: 978-1-62708-310-2
...-energy curve for the α phase. (b) Molar free-energy curves for α and β. Adapted from Ref 3.1 It is clear from Fig. 3.19(b) that A -rich alloys will have the lowest free energy as a homogeneous α phase and B -rich alloys as β phase. For alloys with compositions near the crossover in the G...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240053
EISBN: 978-1-62708-251-8
... decomposition. In this reaction, nucleation occurs homogeneously, which is contrary to most nucleation and growth transformations. Spinodal decomposition is a phase separation reaction that does not involve a nucleation step, as in classical nucleation and growth. Instead, spinodal reactions involve...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420239
EISBN: 978-1-62708-310-2
... method in phase diagram determination is its difficulty in detecting fine precipitates. Many terminal solid solutions have decreasing solubility with decreasing temperature. After an alloy is homogenized, annealed at a lower temperature, and subsequently quenched, precipitates may be so small that even...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.tpmpa.t54480031
EISBN: 978-1-62708-318-8
... two or more elements requires that the elements have compatible sizes, structures, and chemical characteristics. Alloys can contain one phase only; such alloys under equilibrium conditions are called homogeneous alloys. Alloys containing more than one phase are called heterogeneous or two- or...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420015
EISBN: 978-1-62708-310-2
.... Adapted from: Ref 2.1 Two or more different kinds of metal atoms will usually form a homogeneous solution in the liquid state. This behavior is shown for a 50% Fe-50% Cu liquid phase alloy in Fig. 2.1(b) . Here also it is conventional to use the word phase rather than state and to speak of...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420001
EISBN: 978-1-62708-310-2
... arrangement of elements in a material of a given chemical composition. A phase is a physically homogeneous state of matter with a given chemical composition and structure. The simplest examples are the three states of matter (solid, liquid, or gas) of a pure metal. The three phases of a pure metal have the...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.bcp.t52230179
EISBN: 978-1-62708-298-3
... cubic Laves phase with unknown stoichiometry; and zeta, which is a C-14 hexagonal Laves phase with a stoichiometry of FeBe 2 . This phase melts congruently at 1463 °C (2665 °F). All of the intermediate phases appear to have an extensive homogeneity range of composition. Fig. 15.9 Binary phase...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420289
EISBN: 978-1-62708-310-2
... is essentially scrap. If the alloy contains coring, then a homogenizing temperature above T 3 will also cause “burning” of the alloy. A safer temperature is T 4 . During precipitation hardening, if the solutionizing temperature T 5 is chosen instead of T 6 , grain growth of α phase will...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240075
EISBN: 978-1-62708-251-8
...-state reactions intermediate phases ternary phase diagrams binary phase diagrams A PHASE is a homogeneous, physically distinct region of a material that differs in structure and/or composition from another region. A phase may be a single chemical substance or a mixture of two or more substances...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420263
EISBN: 978-1-62708-310-2
... homogeneity ranges. From a simple point of view, substance databases have little complexity because they are assemblages of assessed data for stoichiometric condensed phases and gaseous species. They have none of the difficulties associated with nonideal mixing of substances, which is the case for a...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2016
DOI: 10.31399/asm.tb.ascaam.t59190001
EISBN: 978-1-62708-296-9
... Abstract This chapter serves as a study and guide on the main phase constituents of cast aluminum-silicon alloys, alpha-Al solid solution and Si crystals. The first section focuses on the structure of Al-Si castings in the as-cast state, covering the morphology of the alpha-Al solid solution...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.smnm.t52140107
EISBN: 978-1-62708-264-8
... high-carbon steels). It also addresses process-specific issues, explaining how the presence of carbides (in the two-phase process) produces significant changes, and how homogenization and austenite grain growth influence the single-phase process. austenitization cast iron high-carbon steel low...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2016
DOI: 10.31399/asm.tb.ascaam.t59190035
EISBN: 978-1-62708-296-9
... composition of the Al-Cr intermetallic phases Phase Stoichiometry designation Stoichiometry composition, Cr Range of Cr homogeneity Additions in technical alloys Ref at.% wt% μ Cr Al 4 Cr 20 32.5 30.4–33 wt% 19.7±0.5 at.% 10.4 at.% Ni 4 , 5 , 8 , 10 θ Cr Al 7 Cr 12.5 21.6...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420171
EISBN: 978-1-62708-310-2
... reactions involve spontaneous unmixing or diffusional clustering of atoms, where a two-phase structure forms by spontaneous growth from small composition fluctuations ( Fig. 9.15b ). The result is homogenous decomposition of a supersaturated single phase into two phases that have essentially the same...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780105
EISBN: 978-1-62708-281-5
... the in-phase (elastic or storage) and out-of-phase (viscous or loss) components. The advantages of dynamic mechanical techniques for measuring the rheological properties of a solution or melt include: fast test capability for thermally sensitive materials, ease of sample preparation and subsequent...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2020
DOI: 10.31399/asm.tb.bpapp.t59290085
EISBN: 978-1-62708-319-5
...; no particle is bronze. Repeat chemistry tests on individual particles (smallest scale of scrutiny) record the frequency of each phase. From many repeat tests, the average ratio converges to the bulk chemistry. However, it tells nothing about the homogeneity of the mixture. Possibly the copper and tin...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.tb.msisep.t59220009
EISBN: 978-1-62708-259-4
... and surface tension between the liquid metal and the slag favor phase separation, making it possible to tap the metal and the slag out of the furnace independently, through different openings designed for these purposes. Fig. 2.2 The iron blast furnace process. Left: typical mass balance for...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540297
EISBN: 978-1-62708-309-6
... 7.33. Pinckney L.R. , Phase-Separated Glasses and Glass-Ceramics , Engineered Materials Handbook , Vol 2 , Engineering Plastics , ASM International , 1988 , p 433 – 438 7.34. Duvall D.E. , Effect of Environment on the Performance of Plastics , ASM Handbook , Vol 11...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2000
DOI: 10.31399/asm.tb.aet.t68260119
EISBN: 978-1-62708-336-2
... obtained and, thus, the more efficient this practice becomes in terms of industrial throughput. The homogenization temperature, however, should not exceed the lowest melting point phase temperature in the particular alloy, which results in localized melting. This melting could cause microstructural damage...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.sap.t53000025
EISBN: 978-1-62708-313-3
... homogenization heat treatment is the complete dissolution of all phases and the elimination of as much microsegregation as possible. In aging, or precipitation hardening, the elements taken into solid solution during solution treatment are precipitated in a favorable type and morphology. This controlled...