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volume diffusion

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030082
EISBN: 978-1-62708-282-2
... the critical potential. Some features experimentally observed for dealloying systems are then considered. The chapter concludes by briefly reviewing the proposed mechanisms for the formation of porous metals, namely ionization-redeposition mechanism, surface diffusion mechanism, volume diffusion mechanism...
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Published: 01 November 2011
and grain-boundary migration. (d) Third stage: volume diffusion of atoms to the voids. Source: Ref 6.1 More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.tm.t52320259
EISBN: 978-1-62708-357-7
... of the parent phase, and transit to the lattice points on the side of the product phase ( Fig. 9.2a ). Because this pattern is analogous to the diffusion in a crystal, it is sometimes called “the diffusional type,” but “the thermally activated type” is used here to avoid confusion with the aforementioned...
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Published: 01 July 1997
Fig. 12 Three-stage mechanistic model of diffusion welding. (a) Initial asperity contact. (b) First-stage deformation and interfacial boundary formation. (c) Second-stage grain boundary migration and pore elimination. (d) Third-stage volume diffusion and pore elimination. Source: Ref 7 More
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240063
EISBN: 978-1-62708-251-8
...-state diffusion conditions can readily be visualized by examining Fig. 5.5 . In the first case, gas diffuses from an infinite volume ( P 1 = constant) through a membrane into an infinite volume ( P 2 = constant). The pressure gradient across the membrane remains constant, as does the diffusive flux...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410039
EISBN: 978-1-62708-265-5
... that the growth of a pearlite colony is dependent on the diffusion of carbon atoms through the austenite ahead of the pearlite interface. Such diffusion through a crystal phase is referred to as bulk, or volume, diffusion. Another possibility, however, is that the carbon diffuses along the advancing interface...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240017
EISBN: 978-1-62708-251-8
... an important role in processes such as deformation, annealing, precipitation, diffusion, and sintering. All defects and imperfections can be conveniently classified under four main divisions: point defects, line defects, planar defects, and volume defects. This chapter provides a detailed discussion...
Series: ASM Technical Books
Publisher: ASM International
Published: 31 December 2020
DOI: 10.31399/asm.tb.phtbp.t59310001
EISBN: 978-1-62708-326-3
...-packed, and body-centered cubic. It then describes the four main divisions of crystal defects, namely point defects, line defects, planar defects, and volume defects. The chapter provides information on grain boundaries of metals, processes involved in atomic diffusion, and key properties of a solid...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410277
EISBN: 978-1-62708-265-5
... for spheroidization of an Fe-C alloy (58 kcal/mole) that the rate limiting factor of spheroidization correlates with the volume diffusion of iron atoms (61 kcal/mole), not with the activation energy for the volume diffusion of carbon atoms (20 kcal/mole) ( Ref 13.12 , 13.13 ). Spheroidization of pearlite in an AISI...
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
... in the aerospace industry. Further information on its low temperature analogue, diffusion soldering, can be found in the companion volume Principles of Soldering . It is noteworthy that although diffusion soldering processes are, by definition, performed at process temperatures below 450 °C, the remelt...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900023
EISBN: 978-1-62708-350-8
... remains unchanged. Growth, however, will be experienced due to an increase in the volume of the immediate steel surface and by the nitrogen diffusion ( Fig. 3 ). Fig. 3 Illustration of the growth in volume due to nitriding. The amount of growth will be determined by the time at the selected process...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 April 2004
DOI: 10.31399/asm.tb.ps.t62440001
EISBN: 978-1-62708-352-2
... diffusion altering the shape of the voids Grain boundary and volume diffusion from the bond interface to reduce the void volume A detailed theoretical treatment of solid-state diffusion bonding is provided by Hill and Wallach [1989] . In practice, the extent of bonding and the rate at which...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 1997
DOI: 10.31399/asm.tb.wip.t65930057
EISBN: 978-1-62708-359-1
... metal-to-metal contact at asperities, followed by the removal of interfacial voids and cracks by diffusional and creep process. For conventional diffusion bonding without a diffusion aid, the three-stage mechanistic model shown in Fig. 12 describes bond formation. In the first stage, deformation...
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Published: 01 August 2005
Fig. 2.89 Comparison of activation energies and activation volumes for steady-state creep and lattice self-diffusion for various materials above 0.5 T m . Source: Ref 2.62 More
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.pb.t51230001
EISBN: 978-1-62708-351-5
... carried out below 450 °C, or 840 °F), or diffusion brazing when this temperature threshold is exceeded) is one such example and is discussed in Chapter 6 of this volume and in Chapter 5, section 5.9 of the companion volume Principles of Soldering . From the “maps” of brazes and solders...
Image
Published: 01 August 2018
Fig. 8.28 Schematic presentation of the evolution of solidification in a eutectic cast iron with spheroidal graphite. Initially (a) austenite dendrites and graphite particles can grow independently, from the liquid. (b) From about 30% volume fraction of solid phase, graphite particles begin More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 April 2004
DOI: 10.31399/asm.tb.ps.9781627083522
EISBN: 978-1-62708-352-2
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900231
EISBN: 978-1-62708-350-8
... °F). Determination of the process temperature depends on the steel analysis and the surface metallurgical requirements. A plain low-carbon steel also requires a higher nitriding potential. This is accomplished by simply increasing the process gas nitrogen-to-hydrogen ratio by volume to a ratio...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2022
DOI: 10.31399/asm.tb.dsktmse.t56050001
EISBN: 978-1-62708-432-1
... overview of the types of diffusion: Self-diffusion : Atoms of the same type diffusing within the same metal Interdiffusion : Diffusion of two different types of atoms within each other, as in the case of a binary alloy system (e.g., copper–nickel diffusion couple) Volume diffusion : Movement...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870537
EISBN: 978-1-62708-314-0
... 2 O 3 or graphite. Particulate reinforced composites ( Fig. 20.2 ), primarily SiC or Al 2 O 3 ceramic particles in an aluminum matrix, are known as discontinuously reinforced aluminum (DRA). They exhibit high stiffness, low density, high hardness, and adequate toughness at volume percentages...