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order-disorder transformation

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420171
EISBN: 978-1-62708-310-2
... decomposition intermediate phases order-disorder transformation spinodal transformation structures superlattice structures PHASE DIAGRAMS are often quite complex, with a number of different reactions occurring at different compositions and temperatures. In most cases, the appearance of several...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.tm.t52320197
EISBN: 978-1-62708-357-7
... mentioned below occurs in accordance with heating or cooling. This is called an order-disorder transformation or an order-disorder transition. (Low temperature) ordered state  ⇄  Disordered state (high temperature) This ordering phenomenon was confirmed by x-ray diffraction in 1923...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240041
EISBN: 978-1-62708-251-8
... that it is stable up to the melting point. Fig. 3.6 Solid-solution structures An order-disorder transformation typically occurs on cooling from a disordered solid solution to an ordered phase. During this phase transformation, there is a rearrangement of atoms from random site locations...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.tm.t52320013
EISBN: 978-1-62708-357-7
... and NaCl as shown in Fig. 2.5(b) . Perhaps it is supposed that the change of order is almost equal when a liquid is transformed into a gas because a liquid itself has no structure. 2.2 Entropy and Free Energy <xref ref-type="bibr" rid="t52320013-ref3">(Ref 3...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.bcp.t52230179
EISBN: 978-1-62708-298-3
... at.% or 3 wt%. There are two congruent melting phases: The beta phase, with a cesium chloride-ordered cubic structure, melts at 1420 °C (2590 °F), and the gamma phase melts at 1400 °C (2550 °F). Gamma and gamma prime are closely related, with gamma being a disordered version of gamma prime. There are two...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420263
EISBN: 978-1-62708-310-2
... relationships that reflect structure with respect to different crystal types, but such conditions must be externally formulated and imposed on the model. Equally, special relationships apply if the model is to be used to simulate order-disorder transformations. Fig. 13.2 Simple body-centered cubic...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.tm.t52320259
EISBN: 978-1-62708-357-7
... by a sigmoidal curve ( Fig. 9.1a ). Fig. 9.1 The structure change of the nucleation type (sigmoidal curve) and the non-nucleation type (asymptotic curve) On the other hand, in order-disorder transition, A and B atoms in an ordered solid solution (α) that have been arranged in a perfect order...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410039
EISBN: 978-1-62708-265-5
..., then either a phase transformation (for example, the austenite-to-pearlite transformation under consideration here) or microstructural rearrangement without a phase change (for example, grain growth or particle coarsening) would occur in order to lower free energy to the minimum possible value. The free...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410113
EISBN: 978-1-62708-265-5
..., in contrast to acicular ferrite, the dispersed particles have a granular or equiaxed morphology. The ferrite crystals of the matrix, as shown by TEM ( Ref 7.10 , 7.11 , 7.30 ), are quite fine, on the order of a few micrometers in size; are equiaxed in shape; contain a high density of dislocations...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420303
EISBN: 978-1-62708-310-2
... alloys such as nickel-aluminum and nickel-titanium (~50 to 50 ratio) are also part of this alloy group, with a bcc parent phase. Because the transformations are diffusionless and lattice correspondence is maintained, order or disorder present in the parent phase is transferred to the martensite phase...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1983
DOI: 10.31399/asm.tb.mlt.t62860163
EISBN: 978-1-62708-348-5
...) . Localized enhancement effects in Pd-Ag alloys. Phys. Rev. Lett . 33 , 91 – 94 . 10.1103/PhysRevLett.33.91 Nabarro F. R. N. (1967) . Theory of Crystal Dislocations . Clarendon Press , Oxford . Nix F. C. and Shockley W. (1938) . Order-disorder transformations in alloys...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2012
DOI: 10.31399/asm.tb.lmub.t53550299
EISBN: 978-1-62708-307-2
... ordering temperature ( T c ). These ordered intermetallics usually exist in relatively narrow compositional ranges around simple stoichiometric ratios. Fig. 6.1 Atomic arrangements of conventional alloys and ordered intermetallic compounds. (a) Disordered crystal structure of a conventional alloy...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.tpmpa.t54480141
EISBN: 978-1-62708-318-8
... difference is that intermetallic phases generally melt at a constant temperature. An ordered structure, on heating to a critical temperature, becomes disordered and melts as an alloy over a range of temperatures. Alloys based on the α 2 (Ti 3 Al) and γ (TiAl) ordered structure are termed titanium...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.lmcs.t66560427
EISBN: 978-1-62708-291-4
... sites. Contrast with ordered structure. drawing. (1) A term used for variety of forming operations, such as deep drawing a sheet metal blank; redrawing a tubular part; and drawing rod, wire, and tube. The usual drawing process with regard to sheet metal working in a press is a method for producing...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.tb.ems.t53730011
EISBN: 978-1-62708-283-9
.... Liquids do not have the high degree of order of crystals or the complete disorder of gases. For most materials, freezing causes a volume decrease of 1 to 6%. However, there are a few materials (water, silicon, germanium, bismuth, gallium, etc.) that have packing in the solid state that is not dense...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.sap.t53000017
EISBN: 978-1-62708-313-3
... Antiphase-boundary (APB) energy in the presence of an ordered precipitate (γ′, γ″). The APB represents the energy needed for the dislocation to cut through the ordered precipitate, because cutting could result in disordering between the matrix and precipitate. Volume fraction of the precipitate (γ′, γ...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060333
EISBN: 978-1-62708-261-7
... bronze, spinodal-hardening alloys, and order-hardening alloys) Quench-hardened (martensitic) copper alloys (such as aluminum bronze, nickel-aluminum bronzes, and some copper-zinc alloys) Solution-treated and aged magnesium alloys Solution-treated and aged nickel alloys Solution-treated...
Series: ASM Technical Books
Publisher: ASM International
Published: 31 December 2020
DOI: 10.31399/asm.tb.phtbp.t59310029
EISBN: 978-1-62708-326-3
... ferrite is approximately 2.87 Å at 20 °C (70 °F) and increases to approximately 2.9 Å at 910 °C (1670 °F). In contrast, the lattice parameter of the austenitic unit cell is on the order of approximately 3.57 Å at the transformation temperature of 912 °C (1674 °F). This provides greater interatomic space...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.stg2.t61280025
EISBN: 978-1-62708-267-9
.... The ordered precipitates possess an energy (antiphase domain boundary or APB) representing the extra energy associated with ordered atom positions versus normal disordered or random positions. Higher APB energies require correspondingly more force for deformation to occur. Precipitate size. When the size...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430027
EISBN: 978-1-62708-253-2
... in a liquid state, metals have a highly disordered noncrystalline structure. However, when a molten metal or alloy cools and solidifies to form a bulk solid, it develops a crystalline structure with an ordered arrangement of atoms. In a crystalline solid there is a repetitive or periodic arrangement of atoms...