Particle blocking in grain boundary sliding and associated internal friction

Mori, T.; Koda, Motoi; Monzen, Ryoichi

doi:10.1016/0001-6160(83)90104-9

Cited by 106 publications

(25 citation statements)

References 16 publications

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“…It seems reasonable that both effects make the sliding more difficult and slower. If z' increases the IF peak should appear at higher temperatures, which is experimentally observed in the case of copper with particles of SiOe at GBs, as observed by Mosher and Raj [30] and even by Mori et al [46].…”

Section: + =Ip/4~ ~ 'supporting

confidence: 56%

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Present state of the controversy about the grain boundary relaxation

Povolo

Molinas

1992

Il Nuovo Cimento D

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Summary. --An analysis of the internal friction produced by grain boundary relaxation in metals and alloys and ceramics is presented. The different interpretations given in the literature to relaxation phenomena occurring at temperatures above about half the melting point which include the influence of grain boundaries and their interaction with solutes and precipitates are discussed in detail. A complete set of the experimental data disposable in this field since 1972 up today is rewiewed. Finally, some recent experiments are discussed and new ones are suggested. They might solve the actual controversy about the real origin of the relaxation phenomena observed.PACS 62.40 -Anelasticity, internal friction, and mechanical resonances.

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Section: + =Ip/4~ ~ 'supporting

confidence: 56%

“…(8)) seems to be more realistic. [46] proposed a theory for GB sliding and the associated IF, including the blocking effects of second-phase particles. The authors did not make a detailed calculation of the IF peaks, but they have shown that the relaxation time for the sliding of the particle-bearing boundaries is given by (14) ~' =…”

Section: Z97mentioning

confidence: 99%

Present state of the controversy about the grain boundary relaxation

Povolo

Molinas

1992

Il Nuovo Cimento D

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“…A number of papers have been reported for bicrystal experiments to investigate the grain boundary energy, [5][6][7][8][9] atomic structure, [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] grain boundary sliding [27][28][29][30][31][32][33][34][35] and so on. Although most of them focused on metals, and some papers have reported for ceramics.…”

Section: Introductionmentioning

confidence: 99%

Grain Boundary Sliding and Atomic Structures in Alumina Bicrystals with [0001] Symmetric Tilt Grain Boundaries

et al. 2002

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Orientation controlled alumina bicrystals were fabricated by a hot joining technique at 1773 K in air to obtain [0001] symmetric tilt boundaries including coincidence grain boundaries. The grain boundary energies were measured by the thermal grooving technique, and they were found to strongly depend on the grain boundary character. Atomic structures of those grain boundaries were observed by high-resolution electron microscopy (HREM). It was found that the atomic structures did not always correlate with the grain boundary energies. This finding indicates that the grain boundary energy originates not only from the atomic bonding on the grain boundary but also from the strain of the grain interior in the vicinity of the boundary. The grain boundary sliding was also investigated by the high-temperature creep test. As the results, the grain boundaries with the same energy showed different sliding behavior. The occurrence of grain boundary sliding is considered to depend on the atomic bonding of a grain boundary.

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“…Particle-size dependence of ITE According to the theory by Mori et al (14), a relative displacement U of the adjacent two crystals caused by GBS develops an internal where A has already been defined in eq. (3).…”

Section: Deformationmentioning

confidence: 99%

“…caused by the grain boundary sliding (14). The internal stress just outside the particle evaluated from the following equation (20).…”

mentioning

confidence: 99%

Intermediate Temperature Embrittlement of Dispersion Hardened Cu–GeO<SUB>2</SUB> Polycrystals

1987

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In order to clarify the mechanism of the so-called intermediate temperature embrittlement, CuGeO2 dispersion-hardened alloys were tensile tested at various temperatures between room temperature and 900 K with the strain rate of 10-3 s-1 or 10-4S-1. In the case of single crystals, elongation to fracture increased monotonically with increase in temperature. On the other hand, the ductility of polycrystals first decreased and then increased again, showing the ductility minimum associated with intergranular fracture at an intermediate temperature range around 600 K. The degree of such intermediate temperature embrittlement was sensitive to both the strain rate and the size of GeO2 particles at grain boundaries. Microscopic observation of deformation and fracture characteristics of polycrystalline samples indicated that the initial decrease of ductility occurred concurrently with the occurrence of grain-boundary sliding and that the recovery of ductility at higher temperatures was due to the initiation of extensive recrystallization. It is concluded that in the intermediate temperature range local stress which concentrates near the GeO2 particles on the sliding grain-boundary induces the formation of voids which eventually grow and coalesce to cause intergranular fracture. At higher temperatures, the stress concentration is relaxed by the recrystallization, resulting in the recovery of ductility. The effects of strain rate and particle size on the intermediate temperature embrittlement are also discussed in association with the occurrence and disappearance of the stress concentration.

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Particle blocking in grain boundary sliding and associated internal friction

Cited by 106 publications

References 16 publications

Present state of the controversy about the grain boundary relaxation

Present state of the controversy about the grain boundary relaxation

Grain Boundary Sliding and Atomic Structures in Alumina Bicrystals with [0001] Symmetric Tilt Grain Boundaries

Intermediate Temperature Embrittlement of Dispersion Hardened Cu–GeO<SUB>2</SUB> Polycrystals

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Particle blocking in grain boundary sliding and associated internal friction

Cited by 106 publications

References 16 publications

Present state of the controversy about the grain boundary relaxation

Present state of the controversy about the grain boundary relaxation

Grain Boundary Sliding and Atomic Structures in Alumina Bicrystals with [0001] Symmetric Tilt Grain Boundaries

Intermediate Temperature Embrittlement of Dispersion Hardened Cu&ndash;GeO<SUB>2</SUB> Polycrystals

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Intermediate Temperature Embrittlement of Dispersion Hardened Cu–GeO<SUB>2</SUB> Polycrystals