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diffusional transformation

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Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005599
EISBN: 978-1-62708-174-0
..., and its simplification, for single-parameter models, in which the microstructure evolution may be treated as an isokinetic reaction. It explains that isokinetic microstructure models are applied to diffusional transformations in fusion welding, covering particle dissolution, growth, and coarsening...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003166
EISBN: 978-1-62708-199-3
.... Figure 1 shows how microstructure and properties of as-quenched alloys change with increasing alloy content. Very dilute alloys (<0.3% alloying addition) typically undergo the equilibrium sequence of phase changes, but the alloying elements tend to retard these diffusional transformations...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003780
EISBN: 978-1-62708-177-1
..., preliminary indications suggest that these microstructures may be analogous to bainite in steels (that is, fine two-phase microstructures produced by a combination of displacive and diffusional atom movements). Rapid quenching (>50 °C/s, or 90 °F/s) suppresses most diffusional transformations and produces...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005414
EISBN: 978-1-62708-196-2
... temperatures Fig. 31 Coupling between electromagnetic, thermal, mechanical, and metellurgical models. (1) Heating power generation due to ohmic loss. (2) Temperature-dependent electric conductivity and magnetic permeability. (3) Phase transformation due to temperature changes. (4) Latent head...
Series: ASM Handbook
Volume: 2
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v02.a0001085
EISBN: 978-1-62708-162-7
...-transformation diagram showing heat treatments employed with uranium alloys. Slow cooling results in diffusional decomposition of γ phase to coarse dual-phase microstructures. Quenching results in diffusionless transformation of γ phase to supersaturated martensites, which can be subsequently age hardened. M s...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005536
EISBN: 978-1-62708-197-9
... for Simulation of Diffusional Transformations in Alloys , J. Phase Equilibria , Vol 21 , 2000 , p 269 – 280 7. Andersson J.O. et al. , Thermo-Calc and DICTRA, Computational Tools for Materials Science , CALPHAD , Vol 26 , 2002 , p 273 – 312 8. Ågren J. , Numerical Treatment...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003739
EISBN: 978-1-62708-177-1
... Y. , Jung Y.-C. , Nakai K. , and Shioiri H. , Bainite Transformation and the Diffusional Migration of Bainite/Austenite Broad Interfaces in Fe-9%Ni-C Alloys , Acta Metall. , Vol 49 , 2001 , p 3149 – 3162 10.1016/S1359-6454(01)00234-8 13. Bhadeshia H.K.D.H...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005226
EISBN: 978-1-62708-187-0
... phase, and the formation of noncrystalline phases. It considers three factors to understand the fundamentals of these changes: heat flow, thermodynamic constraints/conditions at the liquid-solid interfaces, and diffusional kinetics/microsegregation. These factors are described in detail. casting...
Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006262
EISBN: 978-1-62708-169-6
... thing) can be found in the literature that covers diffusional transformations in solids ( Ref 25 , 26 ). Retrogression results in a temporary softening of the alloy, as shown in Fig. 4 and 5 . These figures describe the response of the Al-Zn-Mg-Cu alloy 7010 to retrogression at 200 and 240 °C (390...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005409
EISBN: 978-1-62708-196-2
... structure D diffusivity d α thickness of alpha platelet d grain/particle size f α volume fraction of alpha G growth rate during phase transformation G s shear modulus J mass flux K strength coefficient k rate constant in Johnson-Mehl-Avrami-Kolmogorov...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005433
EISBN: 978-1-62708-196-2
... that are divided into two major groups, namely, diffusional accommodation and accommodation by dislocations. References References 1. Hori S. , Tokizane M. , and Furushiro N. , Ed., Preface to asticity in Advanced Materials (ICSAM-91) , JSRS , Osaka, Japan , 1991 2. Sherby...
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002460
EISBN: 978-1-62708-194-8
...: Ref 4 Fig. 14 The microstructure of annealed cartridge brass (70Cu-30Zn), illustrating both grain boundaries and annealing twins. The twins are the regions with parallel sides within the grains. Source: Ref 1 Fig. 29 Diffusional creep results from a higher vacancy concentration...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005425
EISBN: 978-1-62708-196-2
... transformations based on classical nucleation theory and diffusional growth, and grain growth, among others, in the 1940s to1960s. Beginning in the 1980s, the incorporation of the fundamental concepts of thermodynamics and thermal physics (due to, for example, Gibbs, Ising, and others) led to a great expansion...
Book Chapter

By Sammy Tin
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005404
EISBN: 978-1-62708-196-2
... that the creep rate is proportional to the stacking-fault energy. Fig. 7 Larson-Miller plot for S-590 iron Fig. 8 Schematic showing the flow of atoms from compressive boundaries to tensile boundaries during diffusional Nabarro-Herring creep. Vacancy flow occurs in the direction opposite...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005430
EISBN: 978-1-62708-196-2
.... , Computer Simulation of the Austenite/Ferrite Diffusional Transformation in Low Alloyed Steels , Acta Metall. , Vol 30 , 1982 , p 841 – 851 43. Ågren J. , Complex Simulations of Diffusional Reactions in Complex Steels , ISIJ Int. , Vol 32 ( No. 3 ), 1992 , p 291 – 296 44...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003288
EISBN: 978-1-62708-176-4
... is the linear variable differential transformer, which consists of a movable metal core that changes the electrical characteristics with the small motion associated with strain measurements ( Fig. 7 ). Linkages that attach to the specimen typically are made of alloys that can withstand the test temperatures...
Book Chapter

Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003736
EISBN: 978-1-62708-177-1
..., in contrast to other transformations in ferrous systems, such as the formation of pearlite from austenite. A shear mechanism controls this transformation, wherein a large number of atoms move cooperatively and almost at the same time, as opposed to the atom-by-atom movement that occurs in diffusional...
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...
Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006256
EISBN: 978-1-62708-169-6
... Metallurgy of Uranium Alloys , Brook Hill Publishing , 1976 • Eckelmeyer K.H. , “Diffusional Transformations, Strengthening Mechanisms, and Mechanical Properties of Uranium Alloys,” SAND82-0524, Sandia National Laboratories, 1982 • ”Health Physics Manual of Good Practices for Uranium...
Series: ASM Handbook
Volume: 4B
Publisher: ASM International
Published: 30 September 2014
DOI: 10.31399/asm.hb.v04b.a0005950
EISBN: 978-1-62708-166-5
... driven diffusion (Soret effect) (11) Solute (carbon, nitrogen, etc.) content dependent thermal properties (12) Latent heat of dissolution (13) Solute content (carbon, nitrogen) dependent phase transformations (14) Solute enrichment due to diffusional transformations (15) Solute...