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diffusion creep

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Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004018
EISBN: 978-1-62708-185-6
...Abstract Abstract Plastic deformation can occur in metals from various mechanisms, such as slip, twinning, diffusion creep, grain-boundary sliding, grain rotation, and deformation-induced phase transformations. This article emphasizes on the mechanism of slip and twinning under cold working...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005512
EISBN: 978-1-62708-197-9
... also depends on the properties (yield stress, creep behavior, diffusion constants) of the materials being joined and on the condition of the two faying surfaces. Typically, the two surfaces to be bonded are far from smooth on the atomic scale, and the initial contact area between the two surfaces...
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.a0005146
EISBN: 978-1-62708-186-3
... (shear) spinning, rubber-pad forming, stretch forming, contour roll forming, creep forming, vacuum forming, drop hammer forming, joggling, and explosive forming. alpha alloys alpha-beta alloys Bauschinger effect cold forming contour roll forming creep forming diffusion bonding drop hammer...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003266
EISBN: 978-1-62708-176-4
... creep ( Ref 10 ). In diffusional creep, diffusion of single atoms or ions, either by bulk transport (Nebarro-Herring creep) or by grain-boundary transport (Coble creep) leads to Newtonian viscous flow. In this type of creep, steady-state creep rates vary linearly. At low stresses, diffusional creep...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004020
EISBN: 978-1-62708-185-6
..., including low stress behavior, concurrent grain growth, and high stress behavior. ambient temperature creep mechanisms diffusion creep diffusional flow dislocation creep Nabarro-Herring creep strain hardening CONSTITUTIVE RELATIONS for metalworking include elements of behavior at ambient...
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
... to be controlled by lattice diffusion. The problem of diffusional creep was first addressed by Nabarro and Herring ( Ref 16 ). Creep deformation occurs as a result of coordinated atom movement between different interfaces that results in a macroscopic shape change. Intrinsically, this is an extremely slow...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003287
EISBN: 978-1-62708-176-4
..., by characterizing the stress and temperature dependence of the creep rate, it is often possible to identify the rate-controlling mechanism for a particular material. Commonly, it is observed that the activation energy for creep is the same as that for diffusion; hence, the term exp − Q c / kT is replaced...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005411
EISBN: 978-1-62708-196-2
... coalesce to advance the crack. Such crack growth is dominantly intergranular. The kinetics of cavity growth have been modeled as either diffusive growth or as growth constrained by the deformation of the surrounding grains. These have led to models for rationalizing the correlation between creep crack...
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
.... Diffusional creep models do not involve grain rotations that are topologically observed in superplasticity. Ashby and Verrall ( Ref 24 ) proposed a model that explains superplasticity as a transition region between a diffusion-accommodated flow at low strain rates and a diffusion-controlled dislocation...
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
... ). Fortunately, all these mechanisms can be fitted into two basic categories: diffusional creep and dislocation creep. In diffusional creep, diffusion of single atoms or ions either by bulk transport (Nabarro-Herring creep) or by grain-boundary transport (Coble creep) leads to a Newtonian viscous type...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001352
EISBN: 978-1-62708-173-3
... stresses from fabrication. The loading may be continually increasing, as with a conventional tensile test, or static, as with creep tests. Again, these behaviors are quite different. Additionally, some interlayer/base-metal interfaces have been shown to be susceptible to stress-corrosion cracking when...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005556
EISBN: 978-1-62708-174-0
... because these types of welds are, mechanically, quite anisotropic. This includes the case where interlayers may be subjected to residual stresses from fabrication. The loading may be continually increasing, as with a conventional tensile test, or static, as with creep tests. Again, these behaviors...
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.a0005183
EISBN: 978-1-62708-186-3
... describes creep mechanisms that are useful for illustrating the strong stress dependence of dislocation and diffusional flow. ambient temperature Isothermal constitutive modeling physical models strain hardening strain-rate-sensitive flow superplastic flow CONSTITUTIVE RELATIONS...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006787
EISBN: 978-1-62708-295-2
.... Appl. Phys. , Vol 21 , 1950 , p 437 – 445 10.1063/1.1699681 126. Coble R.L. , A Model for Boundary Diffusion Controlled Creep in Polycrystalline Materials , J. Appl. Phys. , Vol 34 , 1963 , p 1679 – 1682 10.1063/1.1702656 127. Weertman J. , Theory of Steady-State...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005606
EISBN: 978-1-62708-174-0
... contact: limited to a few asperities (room temperature). (b) First stage: deformation 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 During...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001350
EISBN: 978-1-62708-173-3
... bonding process. (a) Initial contact: limited to a few asperities (room temperature). (b) First stage: deformation 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...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003292
EISBN: 978-1-62708-176-4
... 0 exp ( − Q R T ) where γ ˙ is the shear creep, k is Boltzmann's constant, T is the absolute temperature, D is the diffusion coefficient that characterizes the creep process, G is the shear modulus, b is the Burgers vector, A is a dimensionless constant, d...
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002472
EISBN: 978-1-62708-194-8
... ). These various processes of creep (dislocation controlled as well as diffusion controlled) may be represented on a deformation mechanism map to highlight regimes of stress and temperature where each mechanism, based on current theories, may be operating ( Ref 17 ). However, such maps are only as good...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006781
EISBN: 978-1-62708-295-2
... thermomechanical fatigue testing. Image shows surface oxidation at bottom and oxide spike forming in the center of the specimen. Chemical etchant used highlights aluminum in the microstructure. Microstructure shown as white in image is depleted of aluminum as a result of aluminum diffusion to surface. Source: Ref...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003517
EISBN: 978-1-62708-180-1
..., microstructural evaluations, the creep cavitation damage assessment, the oxide-scale-based life prediction, and high-temperature crack growth methods. coating evaluation creep cavitation damage assessment elevated-temperature failure gas turbine blade hardness testing high-temperature crack growth...