1-20 of 423 Search Results for

volume diffusion

Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
Close Modal
Sort by
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030082
EISBN: 978-1-62708-282-2
... and above 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...
Series: ASM Technical Books
Publisher: ASM International
Published: 31 December 2020
DOI: 10.31399/asm.tb.phtbp.t59310001
EISBN: 978-1-62708-326-3
.... 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 solution. It also explains the aspects...
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...
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
..., and, as such, grain-boundary diffusion is usually more important than surface diffusion. Typically, the activation energy for grain-boundary diffusion is on the order of only approximately ½ that for volume diffusion. Therefore, volume diffusion is more sensitive to temperature changes than grain-boundary...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410039
EISBN: 978-1-62708-265-5
... and cementite lamellae. Earlier in this chapter it was tacitly assumed 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...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410277
EISBN: 978-1-62708-265-5
... 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 1080 steel containing manganese showed a higher activation energy consistent with the fact that manganese...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420239
EISBN: 978-1-62708-310-2
... degrees of freedom are required to fix temperature and pressure and to vary the composition. Reaction morphologies consisting of two-phase structures (i.e., precipitates or wavy interfaces) are, therefore, thermodynamically forbidden for binary systems, assuming that only volume diffusion takes place...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2011
DOI: 10.31399/asm.tb.jub.t53290137
EISBN: 978-1-62708-306-5
... of surface asperities by plastic flow and creep. (c) Second stage: grain-boundary diffusion of atoms to the voids and grain-boundary migration. (d) Third stage: volume diffusion of atoms to the voids. Source: Ref 6.1 During the second stage of joint formation ( Fig. 6.1b ), two changes occur...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2000
DOI: 10.31399/asm.tb.ttg2.t61120065
EISBN: 978-1-62708-269-3
... (1600 °F) ductile 3003 Al Foil Considered ductile 15Cu-15Ni-Ti 20Cu-20Ni-Ti Powder, foil Brittle when used only as a braze, useful diffusion bonding mechanism 48Zr-48Ti-4Be Powder, ring Brittle but strong 48Zr-48Ti-4Be with 2% Ni Powder Brittle but strong 76.5Al-16.5Cu-4.0Sn-3.0Si...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870537
EISBN: 978-1-62708-314-0
... chuck. TMC, titanium matrix composite Fig. 20.32 Diamond core drilling of a titanium matrix composite component. Source: The Boeing Company Fig. 20.33 Spot welding titanium matrix composite hat stiffeners. Source: The Boeing Company Fig. 20.28 Secondary diffusion bonding...
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 pressure, and V is volume. When dealing with liquids and solids, the PV term is usually very small in comparison to E ; therefore, the enthalpy, H , can be considered as being equal to the internal energy, E ( H ~ E ). Therefore, this allows the Gibbs free energy to be expressed as: (Eq 4.5...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.lmcs.t66560361
EISBN: 978-1-62708-291-4
...) Austenitized, water quenched, tempered at 175 °C. Arrow indicates total depth of decarburization judged from the data in (d). (b) 1% nital. 75×. (c) Picral. 75×. Fig. 12.9 (Part 3) (d) Variation with depth of carbon content, volume fraction of pearlite in the normalized condition, and hardness...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780323
EISBN: 978-1-62708-281-5
... where ϕ m is the solvent volume fraction at the position of maximum osmotic pressure, D is the diffusion coefficient, and ∂ϕ m /∂ t is the mechanical resistance of the polymer. Attempts have been made to apply this model to the environmental failure of plastics ( Ref 25 , 26 ). Assuming...
Series: ASM Technical Books
Publisher: ASM International
Published: 31 December 2020
DOI: 10.31399/asm.tb.phtbp.t59310029
EISBN: 978-1-62708-326-3
... Fig. 10 Variation of diffusion coefficient with carbon concentration. Source: Ref 8 Fig. 7 Volume per atom for iron. Source: Ref 4 Fig. 29 Light micrograph (aqueous 10% sodium bisulfide etch) showing plate martensite and retained austenite in an Fe-1.39C alloy. Source: Ref...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780295
EISBN: 978-1-62708-281-5
... polymers. For EP, a 30% level of filler significantly reduces σ c . Thermal expansion can be defined in a number of ways ( Ref 5 ): In the preceding cases, v is the specific volume, T is the temperature, and L is the length. Thermal diffusivity is related to thermal conductivity ( Ref 5...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240153
EISBN: 978-1-62708-251-8
... characteristics. For example, interstitial carbon can easily diffuse through the open bcc lattice, whereas substitutional elements diffuse much more slowly. Therefore, carbon responds quickly during heat treatment, whereas substitutional alloying elements behave more sluggishly. Interstitial alloying elements...
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
... and tin atoms to diffuse short distances through the liquid to form the lamellar-type structure. It should be pointed out that although eutectics frequently form a lamellar-type structure on freezing, this not always the case. Fig. 5.8 Lamellar eutectic growth. Source: Ref 5.2 The lead-tin...
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
... ( Ref 3.34 ), the rate of atom transfer during diffusion is defined as the flux, J , mass per unit area per unit time, and is dependent on the existing concentration gradient, dc/dx , mass per unit volume per distance over which diffusion occurs. The flux and concentration gradient are related...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870401
EISBN: 978-1-62708-314-0
... delamination curve for carbon/bismaleimide Fig. 15.11 Environmental exposure of carbon/epoxy in Malaysia. Source: Ref 5 Fig. 15.12 Moisture absorption for thermosets and thermoplastics. C/BMI, carbon/bismaleimide; C/E, carbon/epoxy Fig. 15.13 Example of non-Fickian diffusion...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.smnm.t52140189
EISBN: 978-1-62708-264-8
...Abstract Abstract The design requirements for mechanical shafts, pinions, and gears often call for features with very hard surfaces (to resist wear) based on a softer core (to avoid brittle fracture). This chapter explains how to selectively harden steel by diffusing carbon and nitrogen atoms...