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grain-boundary sliding

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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: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003292
EISBN: 978-1-62708-176-4
... with a creep process: the stress and strain rate, strain rate or stress and temperature, strain rate or stress and grain size, and strain contributed by boundary sliding and total strain. The article describes the deformation characteristics and mechanisms of low-stress region, intermediate-stress region...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005458
EISBN: 978-1-62708-196-2
... by superplastic and hot forming processes. Grain-boundary cavitation, observed under temperature and strain-rate conditions for which the boundaries are weaker than the grain interiors, often results from grain-boundary sliding and the concentration of strain around nondeformable particles and hard second phases...
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
... microstructural or mechanistic description. As a rule of thumb, elongation in excess of 200% is termed as superplasticity. Over the years, a number of superplasticity models have been proposed. A majority of experimental evidences suggests that grain-boundary sliding (GBS) is the dominant deformation mechanism...
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
...-dependent part increases at the expense of the rate-dependent part. In addition to the dislocation-based anelasticity discussed so far, anelastic strain is also contributed by grain-boundary sliding at extremely low stresses, which is excluded from the present model. Plastic As the mobile dislocation...
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
... by grain-boundary sliding at extremely low stresses, which is excluded from the present model. Plastic As the mobile dislocation density builds up to a significant level, leakage occurs through the barriers, aided by thermal activation. Consequently, yielding begins, starting with the grains most...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002410
EISBN: 978-1-62708-193-1
.... Typical carbide compositions include M 23 C 6 , M 6 C, and MC. Although carbides were initially thought to be deleterious to the creep behavior of nickel-base superalloys, subsequent experience has shown them to increase the creep resistance of polycrystalline alloys by making grain-boundary sliding more...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0009003
EISBN: 978-1-62708-185-6
... temperature increases that produce local softening. Increasing the temperature of deformation leads to significant changes in deformation behavior and fracture mode. At temperatures above one-half the melting point, particularly at low strain rates, grain-boundary sliding becomes prominent. This leads...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0009013
EISBN: 978-1-62708-185-6
... cavities, probably occurs at the intersection of surfaces of grain-boundary sliding or cooperative grain-boundary sliding within the material ( Ref 8 ). Consequently, although a given processing map might seem suitable to design how a material should be processed under specific conditions, it might...
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
... as the theories on which they are based and give no guidance on deformation path dependence. Another important deformation process in metallic and ionic polycrystals at high temperature and low stresses is grain-boundary sliding ( Ref 18 ). The resistance to sliding is determined by the mobility of grain...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005409
EISBN: 978-1-62708-196-2
... in a regime in which deformation is accomplished largely by grain-boundary sliding and secondarily by dislocation-glide processes. Thus, the enhancement of diffusion during superplastic flow would be expected to be less than that during higher-strain-rate conventional forming. Hence, the observed increase...
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
... the material, temperature-assisted grain-boundary evolution, and temperature-driven surface oxidation, among other things. This article discusses some of the major aspects and challenges of dealing with TMF life prediction. It describes the damage mechanisms of TMF and covers various experimental techniques...
Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.a0001834
EISBN: 978-1-62708-181-8
... tested at 815 °C (1500 °F). 350 ×. Specimens at bottom etched with mixture of HCl, HNO 3 , and H 2 O. Fig. 75 One mechanism of intergranular cracking. (a) Schematic showing cracking due to grain-boundary sliding. Arrows along a grain boundary indicate that this boundary underwent sliding. (b...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006780
EISBN: 978-1-62708-295-2
... changes, such as slip bands, grain-boundary sliding, cavity formation and growth, and cracking (grain boundary, interphase boundary, and transgranular). Other potential microstructural changes include in situ graphitization that occurs in iron-base alloys without adequate carbide-stabilizing elements...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004017
EISBN: 978-1-62708-185-6
... sliding becomes prominent. This leads to wedge-shaped cracks that propagate along grain boundaries and result in low ductility. Such cracking is common at the low strain rates found in creep, but is not a frequent occurrence at the faster strain rates in deformation processes unless there are brittle...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.9781627081856
EISBN: 978-1-62708-185-6
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003546
EISBN: 978-1-62708-180-1
... the grain-boundary sliding Grain-boundary carbides (in polycrystalline materials) to reduce the creep rate by inhibiting grain-boundary sliding The way in which cracking occurs could be envisioned as oxidation of a grain boundary at high temperatures and cracking by slip-band impingement at low...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003590
EISBN: 978-1-62708-182-5
..., at which creep mechanisms become operative. The three important creep mechanisms in oxides are grain- boundary sliding, Herring-Nabarro creep, and climb. Grain-boundary sliding allows relative motion along the inherently weak boundaries. Herring-Nabarro creep allows grain elongation by diffusion of ions...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003545
EISBN: 978-1-62708-180-1
... and annihilate through recovery events. Creep deformation also produces microstructural changes, such as slip bands, grain-boundary sliding, cavity formation and growth, and cracking (grain boundary, interphase boundary, and transgranular). There are others, some of which are very important. One is in situ...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001423
EISBN: 978-1-62708-173-3
... strain from residual stress, grain boundary sliding is one mechanism that operates to accommodate the strain. Large grain size does not accommodate the strain as readily as smaller grain size, and the potential for crack initiation at grain boundary triple points, and therefore liquation cracking...