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diffusion path

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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
... on several applications of the latter. The chapter also provides information on the temperature dependence of diffusion, intrinsic diffusion coefficients (Kirkendall effect), and high diffusion paths. diffusion interstitial diffusion substitutional diffusion Fick’s laws of diffusion intrinsic...
Series: ASM Technical Books
Publisher: ASM International
Published: 23 January 2020
DOI: 10.31399/asm.tb.stemsem.t56000020
EISBN: 978-1-62708-292-1
...Abstract Abstract This chapter discusses the setup and use of a transmission electron detector in a typical scanning electron microscope (SEM). It describes the arrangement and function of the primary components in the detector, following the signal path from the sample to a micromirror array...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240265
EISBN: 978-1-62708-251-8
... of the flow, vacancies and atoms occurs within the grain boundaries themselves. Because diffusion is very sensitive to temperature, at lower temperatures the main diffusion path is along the grain boundaries, since the activation energy for grain-boundary diffusion is considerably less than that for bulk...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030033
EISBN: 978-1-62708-282-2
... is related to the stabilization criteria described subsequently. Rougher surfaces have more occluded sites, which can sustain the conditions required for active dissolution at lower current densities and thus lower potentials because of the longer diffusion path length and slower rate of diffusion...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610415
EISBN: 978-1-62708-303-4
... but also gradually extends plastically. Thus, a metal subjected to a constant tensile load at elevated temperature will creep and undergo a time-dependent increase in length. Because the mobility of atoms increases with increasing temperature, diffusion-controlled mechanisms become active. Dislocation...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2011
DOI: 10.31399/asm.tb.jub.t53290137
EISBN: 978-1-62708-306-5
... have no impact on interface strength. Again, diffusion processes cause the shrinkage and elimination of voids, but the only possible diffusion path is now through the volume of the grains themselves. The nature of the starting surface is of considerable importance because of the small macroscopic...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110228
EISBN: 978-1-62708-247-1
.... Guidelines for interpreting results on speed path analysis are given. Cross-Sectional View of OBIC Sources Examples of Well OBIC Sources in LADA Images The Drift (Fast) and Diffusion (Slow) Components of OBIC Guidelines to Interpret Results for a Speed Path Analysis LADA Laser Interaction...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.ssde.t52310109
EISBN: 978-1-62708-286-0
... interstitially much more rapidly than chromium can substitutionally, chromium is combined in situ, especially along grain boundaries, which are fast-diffusion paths. This locally depletes chromium, and the alloy is sensitized. This can be eliminated by a sufficiently long homogenization anneal at a low enough...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.ssde.t52310257
EISBN: 978-1-62708-286-0
.... The most familiar form of this problem occurs when austenitic alloys having carbon levels above 0.03% are welded. The region near the weld where temperatures reach 600 to 900 °C (1100 to 1650 °F) may have carbon migrate to and along grain boundaries, the fast diffusion paths, where it combines with less...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2001
DOI: 10.31399/asm.tb.secwr.t68350125
EISBN: 978-1-62708-315-7
... Yes >RT >RT 10 –8 –1.3 10 –7 –10 <1–10 Yes No Thermal diffusion 51–3800 2–150 49–71 (C, N) Average to good No 480–1040 900–1900 40–>100 300–>760 10–100 No, except for C Reheat treatment Ion nitriding 51–640 2–25 60–72 Average, poor on stainless steel...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2020
DOI: 10.31399/asm.tb.bpapp.t59290169
EISBN: 978-1-62708-319-5
... is a second phase. With respect to sintering densification, grain boundaries are most important. They provide a diffusion path for shrinkage and grain growth. As grain growth occurs, the grain-boundary area declines, leading to slower sintering. Thus, additives are used to improve shrinkage rates...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.htcma.t52080097
EISBN: 978-1-62708-304-1
... as increases in nickel and/or chromium. Increasing nickel in Fe-Ni-Cr alloys improves carburization resistance. Nickel reduces the diffusivity of carbon in Fe-Ni-Cr alloys. Nickel also reduces the solubility of carbon in Fe-Ni alloys. Among these alloying elements, silicon is the most effective in improving...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130503
EISBN: 978-1-62708-284-6
... in Steels: Interactions, Traps and Crack Paths , Hydrogen Effects in Metals , Bernstein I.M. and Thompson A.W. , Ed., Metallurgical Society of AIME , 1981 , p 113 – 122 35. Pressouyre G.M. , Hydrogen Traps, Repellers, and Obstacles in Steel: Consequence on Hydrogen Diffusion...
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
... to produce a hemispherical nodule. The mechanism of pearlite growth involves the rejection of carbon by the growing ferrite plates and its incorporation into the cementite. This process requires diffusion of carbon by one or more of three paths: through the austenite, through the ferrite, or along...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.caaa.t67870075
EISBN: 978-1-62708-299-0
... , 1969 9. Bothwell M.R. , New Technique Enhances Corrosion Resistance of Aluminum , Met. Prog. , Vol 87 , March 1985 , p 81 10. Ikeda H. , Protection Against Pitting Corrosion of 3003 Aluminum Alloy by Zinc Diffusion Treatment , Aluminum , Vol 58 ( No. 8 ), 1982 , p...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420143
EISBN: 978-1-62708-310-2
... the rejection of carbon by the growing ferrite plates and its incorporation into the cementite. This process requires diffusion of carbon by one or more of three paths: through the austenite, through the ferrite, or along the interface. The lower the transformation temperature, the greater is the chemical...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.sap.t53000017
EISBN: 978-1-62708-313-3
... percent in atomic size ( Ref 2 ). The use of high-melting-point elements as the solutes provides stronger lattice cohesion and reduces diffusion, particularly at high temperatures. Similar considerations apply to the hardening of the γ′ phase. Solid-solution hardening also has the effect of decreasing...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030082
EISBN: 978-1-62708-282-2
... dissolution : The surface diffusion model was extended to account for preexisting interconnected paths of like elements in the binary alloy ( Ref 56 ) and was later extended to include curvature effects on the dissolution potential ( Ref 26 , 57 ). Before briefly reviewing the proposed mechanisms...
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: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940127
EISBN: 978-1-62708-302-7
...Abstract Abstract This chapter develops a corrosion model that accounts for solution potentials and the effects of coupling between cathodic and anodic reactions. It begins by examining potential differences at various points (in the solution) along a path from the anode to the cathode area...