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spinodal transformation structures

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Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003732
EISBN: 978-1-62708-177-1
...Abstract Abstract Spinodal transformation is a phase-separation reaction that occurs from kinetic behavior. This article discusses the theory of spinodal decomposition, and outlines the methods used in the characterization of spinodal structures in metal matrices. microstructure spinodal...
Book Chapter

Series: ASM Handbook
Volume: 3
Publisher: ASM International
Published: 27 April 2016
DOI: 10.31399/asm.hb.v03.a0006229
EISBN: 978-1-62708-163-4
.... This article describes the order-disorder transformation that typically occurs on cooling from a disordered solid solution to an ordered phase. It provides a table that lists selected superlattice structures and alloy phases that order according to each superlattice. The article informs that spinodal...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003730
EISBN: 978-1-62708-177-1
... morphological structures from solid-state transformations are covered in subsequent articles on: Precipitation structures Spinodal decomposition Ordered structures Eutectoid structures Massive transformation Martensitic structures (ferrous, non-ferrous, shape memory) Bainitic structures...
Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006250
EISBN: 978-1-62708-169-6
..., and grain growth. The article also describes the various types of solid-state transformations such as isothermal transformation and athermal transformation, resulting from the heat treatment of nonferrous alloys. It provides information on the homogenization of chemical composition within a cast structure...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003721
EISBN: 978-1-62708-177-1
... and resistant to microstructural coarsening. Structures in which Each Phase is Closely Interconnected Structures in which each phase is closely interconnected can result from spinodal decomposition (see the article “Spinodal Transformation Structures” in this Volume). The scale of these spinodal...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003731
EISBN: 978-1-62708-177-1
... undercoolings or supersaturations (see the article “Spinodal Transformation Structures” in this Volume). The GP zones are the first to nucleate because of their small size and coherency with the matrix. The interfacial energy term is extremely low, providing a low barrier to nucleation, although...
Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006277
EISBN: 978-1-62708-169-6
... and nonconventional intragranular transformation pathways, such as pseudospinodal mechanism ( Ref 7 , 9 ), precursory spinodal mechanism ( Ref 22 ), and precursory ω (hexagonal structure) precipitation-assisted α nucleation ( Ref 24 , 25 ). Pseudospinodal (PS) Mechanism Pseudospinodal (PS) mechanism involves...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003723
EISBN: 978-1-62708-177-1
.... This distinctive morphology is a type of eutectoid structure (as briefly described in the section “The Iron-Carbon Eutectoid” in this article and in the separate article “Invariant Transformation Structures” in this Volume). The key point is that equilibrium phase diagrams are important in identifying phase...
Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006274
EISBN: 978-1-62708-169-6
... particles with a structure corresponding to a highly ordered Mg 2 Si. At higher temperatures, this transition phase, designated β′, undergoes diffusionless transformation to the equilibrium Mg 2 Si. Age-hardenable aluminum alloys with strengthening due to Mg 2 Si precipitation include Al-Mg-Si wrought...
Series: ASM Handbook Archive
Volume: 10
Publisher: ASM International
Published: 01 January 1986
DOI: 10.31399/asm.hb.v10.a0001763
EISBN: 978-1-62708-178-8
...-angle neutron scattering (SANS) used to characterize the periodic, quasiperiodic, and random structures of matter should be helpful in the study of all materials because they can provide information on as-received samples over large sample volumes at microstructural sizes comparable to the electron...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003720
EISBN: 978-1-62708-177-1
..., brittle, and fatigue fracture with illustrations. It discusses microanalysis with a focus on the method of light microscopy and includes information of scanning electron microscope in fractography. The article also explains the characteristics of solidification, transformation, deformation structures...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005410
EISBN: 978-1-62708-196-2
..., this transformation cannot proceed through the continuous development of growing infinitesimal perturbations delocalized in the whole phase, that is, by spinodal decomposition ( Ref 13 , 14 ). Such perturbations in a metastable state increase the free energy. As a consequence, they can appear because of thermal...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.9781627081771
EISBN: 978-1-62708-177-1
Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006276
EISBN: 978-1-62708-169-6
... phase in the copper-zinc system. Rapid cooling from the high-temperature beta phase in copper-aluminum alloys generates a martensitic transformation (as in steels) to produce a nonequilibrium phase (β′) that has a hexagonal crystal structure and is ordered. Other elements and metals are alloyed...
Series: ASM Handbook Archive
Volume: 10
Publisher: ASM International
Published: 01 January 1986
DOI: 10.31399/asm.hb.v10.a0001754
EISBN: 978-1-62708-178-8
... resolution to features which are ∼1 μm or larger. Although this value is small, many microstructural features influencing the properties of metals and alloys are too small to be observed using optical microscopy. Dislocations, numerous types of second-phase particles, spinodal and ordered structures...
Series: ASM Handbook
Volume: 4D
Publisher: ASM International
Published: 01 October 2014
DOI: 10.31399/asm.hb.v04d.a0005989
EISBN: 978-1-62708-168-9
..., the only heat treatment applied to the ferritics is annealing. This treatment relieves stresses developed during welding or cold working and provides a more homogeneous structure by dissolving transformation products formed during welding. The most significant ferritic stainless steels alloys...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005524
EISBN: 978-1-62708-197-9
... between physical processes during welding. Some of these physical processes include heat and mass transfer, phase transformations, electromagnetic phenomena, plastic strain, and reactions with the environment during welding/joining. Researchers, including Ashby ( Ref 2 ), Bhadeshia ( Ref 3 ), Cerjak ( Ref...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005561
EISBN: 978-1-62708-174-0
...? A review of the literature shows that the development of physics-based models is indeed challenging due to the complex interaction between physical processes during welding. Some of these physical processes include heat and mass transfer, phase transformations, electromagnetic phenomena, plastic strain...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002404
EISBN: 978-1-62708-193-1
... toughness, demonstrating that the spinodal reaction is responsible for most of the embrittlement while the second-phase precipitates play a minor role. Fig. 21 Electron micrographs of aged type 308 weld. (a) Aged at 475 ° C for 1000 h, showing mottled structure indicative of spinodal decomposition...
Series: ASM Handbook Archive
Volume: 10
Publisher: ASM International
Published: 01 January 1986
DOI: 10.31399/asm.hb.v10.a0001772
EISBN: 978-1-62708-178-8
... discussed in Example 1 in the section “Applications” in this article ( Fig. 31 and 32 ). Periodic composition fluctuations in a spinodally decomposing alloy may be analyzed using a Fourier transformation of the data. In principle, this provides information on the spectrum of wavelengths present...