On annealing twins and CSL distributions in F.C.C. polycrystals

Palumbo, G.; Aust, K.T.; Erb, U.; King, P. J.; Brennenstuhl, A.M.; Lichtenberger, P. C.

doi:10.1002/pssa.2211310216

Cited by 85 publications

(24 citation statements)

References 8 publications

(5 reference statements)

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“…The prominence factors calculated both for the zirconia average samples (A 3,1550 = 0.52, A 3,1700 = 0.53, A 9,1550 = 0.60, A 9,1700 = 0.57) and for the simulated random model (A 3,S = 0.53, A 9,S = 0.64) fall in the range given for fcc metals. Therefore, the limit of 0.5 given by Schuh et al [38] might be a too small lower bound for the twin prominence factors in fcc metals and the range given by Gertsman and Tangri [39] and Palumbo et al [40] are probably more appropriate to describe microstructures dominated by annealing twinning.…”

Section: Triple Junction Character and Prominence Factors In Zirconiamentioning

confidence: 96%

CSL grain boundary distribution in alumina and zirconia ceramics

Vonlanthen

Grobéty

2008

Ceramics International

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The distributions of general and coincidence site lattice (CSL) grain boundaries (GBs) in texture-free alumina and zirconia ceramics sintered at two different temperatures were investigated based on electron backscatter diffraction (EBSD) measurements. Results were compared with the distributions obtained from random 2D spatial models and with calculated random distributions reported in the literature. All alumina samples independent on sintering temperature show the same characteristic deviations of the measured general GB distributions from the random model. No such features can be seen in zirconia. The total fractions of CSL GBs in alumina and zirconia samples are clearly larger, for both sintering temperatures, than those observed in the random simulations. A general GB prominence factor, similar to the twin prominence factor for fcc metals, was defined to simplify the representation of the CSL GB content in zirconia. The observed deviations from the random model show no dependence on sintering temperature nor on lattice geometry. In alumina, however, the change in the CSL GB character distribution with sintering temperature seems to be crystallographically controlled, i.e. directly dependent on the orientation of the CSL misorientation axis.

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Section: Triple Junction Character and Prominence Factors In Zirconiamentioning

confidence: 96%

CSL grain boundary distribution in alumina and zirconia ceramics

Vonlanthen

Grobéty

2008

Ceramics International

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“…Palumbo et al [39] proposed the ''twin limited'' microstructure. They thought that as a consequence of both energetic and crystallographic constraints associated with twinning, a CSL distribution consisting entirely of low-R CSL boundaries was attainable.…”

Section: Distance (µM)mentioning

confidence: 99%

Grain Cluster Microstructure and Grain Boundary Character Distribution in Alloy 690

Xia

Zhou

Chen

2009

Metall Mater Trans A

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The effects of thermal-mechanical processing (TMP) on microstructure evolution during recrystallization and grain boundary character distribution (GBCD) in aged Alloy 690 were investigated by the electron backscatter diffraction (EBSD) technique and optical microscopy. The original grain boundaries of the deformed microstructure did not play an important role in the manipulation of the proportion of the R3 n (n = 1, 2, 3…) type boundaries. Instead, the grain cluster formed by multiple twinning starting from a single nucleus during recrystallization was the key microstructural feature affecting the GBCD. All of the grains in this kind of cluster had R3 n mutual misorientations regardless of whether they were adjacent. A large grain cluster containing 91 grains was found in the sample after a small-strain (5 pct) and a high-temperature (1100°C) recrystallization anneal, and twin relationships up to the ninth generation (R3 9 ) were found in this cluster. The ratio of cluster size over grain size (including all types of boundaries as defining individual grains) dictated the proportion of R3 n boundaries.

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“…The proportion and spatial arrangement of damage-resistant boundaries are of primary importance for this. Palumbo et al (1992) proposed that the`theoretical limit' for the fraction of AE3 boundaries, which are supposedly the most damage resistant, in the polycrystal is 2a3, and this ®gure has been used in the subsequent models. The 2a3 limit is based on the consideration of the triple junction as the building block of the polycrystal and it has been projected to the threedimensional case as well.…”

Section: Figurementioning

confidence: 99%

Coincidence site lattice theory of multicrystalline ensembles

Gertsman

2001

Acta Cryst Sect A

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It is shown how the coincidence site lattice theory, developed originally for grain boundaries and extended recently to triple junctions, can be applied to more complex ensembles of crystallites with the cubic crystal structure. These include quadruple points, multiple junctions of grains and other multicrystal assemblies. Application of the theory is demonstrated on hypothetical examples, which may help elucidate some practically important problems.

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On annealing twins and CSL distributions in F.C.C. polycrystals

Cited by 85 publications

References 8 publications

CSL grain boundary distribution in alumina and zirconia ceramics

CSL grain boundary distribution in alumina and zirconia ceramics

Grain Cluster Microstructure and Grain Boundary Character Distribution in Alloy 690

Coincidence site lattice theory of multicrystalline ensembles

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