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solid phase diffusion

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.tm.t52320167
EISBN: 978-1-62708-357-7
...Abstract Abstract This chapter provides a detailed discussion on the Brownian motion, diffusion coefficient , and Fick's diffusion laws. It presents a review of solid phase diffusion and discusses the mechanism of diffusion and diffusion coefficient. Brownian motion diffusion coefficient...
Image
Published: 01 April 2004
Fig. 2.49 Growth of tin-base intermetallic phases by solid-state diffusion at 170 °C (340 °F) on various substrate materials. Adapted from Kay and Mackay [1976 ] More
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
... heating. It describes the intermediate phases that are formed during solidification between the two extremes of substitutional solid solution on the one hand and intermetallic compound on the other. The chapter concludes with a section on strain aging in low-carbon steels that allows the interstitial...
Series: ASM Technical Books
Publisher: ASM International
Published: 31 December 2020
DOI: 10.31399/asm.tb.phtbp.t59310001
EISBN: 978-1-62708-326-3
... of a solid solution. It also explains the aspects of a phase diagram that shows what phase or phases are present in the alloy under conditions of thermal equilibrium. Finally, a discussion on the applications of equilibrium phase diagrams is presented. atomic bonding body-centered cubic equilibrium...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060013
EISBN: 978-1-62708-261-7
... in the crystal structure of metals and their role in mechanical deformation, annealing, precipitation, and diffusion. It describes the concept of solid solutions and the effect of temperature on solubility and phase transformations. The chapter also discusses the formation of solidification structures, the use...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.stg2.t61280149
EISBN: 978-1-62708-267-9
... welding techniques, defect prevention, fixturing, heat treatments, and general practices, including the use of filler metals. It also discusses several solid-state welding methods, superplastic forming, and transient liquid phase bonding, a type of diffusion welding process. The chapter includes extensive...
Series: ASM Technical Books
Publisher: ASM International
Published: 31 December 2020
DOI: 10.31399/asm.tb.phtbp.t59310029
EISBN: 978-1-62708-326-3
... information on iron phase transformation, hysteresis in heating and cooling, ferrite and austenite as two crystal structures of solid iron, and the diffusion coefficient of carbon. austenite bainite carbon cementite diffusion coefficient ferrite heat treatment iron martensite microstructure...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240053
EISBN: 978-1-62708-251-8
... is controlled almost exclusively by the rate of heat removal. 4.4 Solid-State Phase Transformations Solid-state phase transformations occur when one or more parent phases, usually on cooling, produces a new phase or phases. The most important mechanisms are nucleation, growth, and diffusion. However...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420117
EISBN: 978-1-62708-310-2
... on cooling through the peritectic isotherm. The generalized form of this peritectic reaction is: L + α → β   ( peritectic reaction ) Because the β phase surrounds the solid α particles, as shown in Fig. 6.1 , α atoms must diffuse through the β crust to reach the liquid for the reaction...
Image
Published: 01 August 2018
” line is where the solid phase fraction is zero, that is, the line that defines the temperatures and compositions where the solid phase starts to appear in equilibrium. As solidification progresses, solute has no time to diffuse into the previously formed solid and the solid average composition (dashed More
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.pb.t51230207
EISBN: 978-1-62708-351-5
... with regard to service temperature and metallurgical simplicity that is obtainable from diffusion bonding. This process uses a molten filler metal to initially fill the joint gap, but during the heating stage, the filler diffuses into the material of the components to form solid phases and, in consequence...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420143
EISBN: 978-1-62708-310-2
... hypoeutectoid structures invariant transformation peritectoid transformation EUTECTOID AND PERITECTOID transformation are classified as solid-state invariant transformations. Invariant transformations are isothermal reversible reactions that occur at an invariant point on the phase diagram of an alloy...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420087
EISBN: 978-1-62708-310-2
..., the β phase rejects A atoms. If the α and β phases grow separately, solute rejection would occur only in the growth direction. This involves long-range diffusion. Therefore, a very large boundary layer would be created in the liquid ahead of the solid-liquid interface, as shown in Fig. 5.17...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420239
EISBN: 978-1-62708-310-2
... that only volume diffusion takes place. In a ternary system, on the other hand, it is possible to develop two-phase areas in the diffusion zone because of the extra degree of freedom. The diffusion zone morphology, which develops during solid-state interaction in a ternary couple, is defined by type...
Image
Published: 01 August 2018
. It is important to observe that the composition of the solid phase already formed must vary as solidification progresses. This can only happen by solid-state diffusion. More
Image
Published: 01 December 2008
Fig. 6.4 Interdiffusion in A-B system. (a) The concentration-distance curve for a completely miscible solid-solution system. Arrows are the values of mean distance of diffusion ( Z ¯ ) divided by D . (b) The concentration-distance curve in case of α/β two-phase More
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
... of undercooled or supersaturated phases. It is does not involve a nucleation step, which is the mechanism of classical nucleation and growth ( Fig. 9.15a ) of precipitates from a metastable solid solution. Instead, spinodal reactions involve spontaneous unmixing or diffusional clustering of atoms, where a two...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410017
EISBN: 978-1-62708-265-5
... microstructure solid solutions steel STEEL CAN BE processed to produce a great variety of microstructures and properties. Desired results are accomplished by heating in temperature ranges where a phase or combination of phases is stable (thus producing changes in the microstructure or distribution...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420015
EISBN: 978-1-62708-310-2
... phase particles proceeds until the equilibrium fraction is attained. Particle growth in a solid is controlled by diffusion, in which atoms diffuse from the parent phase across the phase boundary and into the growing second-phase particles. Because this is a diffusion-controlled process, the grow...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.tm.t52320259
EISBN: 978-1-62708-357-7
... nothing to do with “nucleation” or “incubation periods,” and the relationship between the rate of change and the time can be shown by an asymptotic curve ( Fig. 9.1b ). Diffusion Control or Interface Control? The phenomenon that β phase mainly composed of B atoms is precipitated from α solid...