High-resolution TEM Analysis of Defect Structures in Mechanically Milled, Nanocrystalline Fe

Murayama, Mitsuhiro; Howe, James M.; Hidaka, Hideyuki; Takaki, Setsuo

doi:10.2355/isijinternational.43.755

Cited by 13 publications

(3 citation statements)

References 25 publications

(28 reference statements)

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“…That is, the atomic structures of these grain boundaries in the ARB-Cu are similar to those of the equilibrium grain boundaries. Murayama et al 28) reported that grain interior and grain boundary structures of mechanically milled iron had partial disclination dipoles with high strain energy by HRTEM. However, lattice defects like disclination were not observed in the present grain boundaries in the ARB-Cu.…”

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confidence: 99%

Grain Boundary Structure of Ultrafine Grained Pure Copper Fabricated by Accumulative Roll Bonding

et al. 2008

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Grain boundary structures of ultrafine grained pure copper (Cu) fabricated by the accumulative roll bonding (ARB) have been studied. The atomic structures of grain boundaries in the ARB processed Cu (ARB-Cu) were observed by high resolution electron microscopy. In order to compare the grain boundaries in the ARB-Cu with equilibrium grain boundaries, the grain boundary energy and structure of symmetric tilt boundaries with h110i common axis in pure Cu were computed by molecular dynamics simulation (MD). The low angle boundaries in the ARBCu were basically described by conventional dislocation model and simultaneously there were some local structures having certainly high energy configurations. The grain boundaries with large misorientation in the ARB-Cu are basically described by the structural units predicted for the normal grain boundaries by MD. The present results indicate that the atomic structures of the boundaries in the Cu severely deformed by the ARB are rather similar to those of the equilibrium grain boundaries, except for the local distortions.

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confidence: 99%

Grain Boundary Structure of Ultrafine Grained Pure Copper Fabricated by Accumulative Roll Bonding

et al. 2008

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“…The distribution is relatively narrow as shown in figure 4. The hot compaction has permitted the apparition of equiaxed grains eliminating the elongated grains obtained in the milling process [15]. This fact is confirmed by the regularity of the diffraction rings, as depicted in the SAD which appear free of dots in the interior of ring corresponding to planes {110}.…”

Section: Methodsmentioning

confidence: 70%

Study of the Nanometric Grain Size Distribution in Iron Compacts Obtained by Mechanical Milling

Llumà

Benito

Roca

et al. 2006

MSF

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Abstract.A study has been carried out on the grain size distribution of cylindrical compacts obtained by consolidation of iron powder severely deformed by mechanical milling. Consolidation has been performed in two consecutive steps: cold and hot conditions. The hot one was done at two temperatures, namely 425 and 475ºC. After milling, the iron powder has a grain size of 8 nm (± 4 nm) with an average hardness of 800 HV. After hot compaction the grain size increases up to 50 nm, especially at 475ºC where a small fraction of grains reach larger values than the average. The grain size was evaluated by two different techniques, X-Ray Diffraction and Transmission Electron Microscopy. Results showed some differences between both methods. The advantage of using TEM is that grain size distribution, and not only the average size, can be obtained. Small discs were also obtained from the compacted specimen in order to fracture them on a "ball on three balls" equipment. The fracture behaviour of the samples was then studied by SEM.

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“…In considering the above results, we paid attention to the recently discovered the so-called collective nanoshears initiated by dynamic deformation [4].…”

Section: Cr-3ni-mo-v Constructional Steelmentioning

confidence: 99%

The conditions for dynamic recrystallization of metals in shock waves

Meshcheyakov¹,

Atroshenko²,

Divakov³

et al. 2012

AIP Conference Proceedings

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High-resolution TEM Analysis of Defect Structures in Mechanically Milled, Nanocrystalline Fe

Cited by 13 publications

References 25 publications

Grain Boundary Structure of Ultrafine Grained Pure Copper Fabricated by Accumulative Roll Bonding

Grain Boundary Structure of Ultrafine Grained Pure Copper Fabricated by Accumulative Roll Bonding

Study of the Nanometric Grain Size Distribution in Iron Compacts Obtained by Mechanical Milling

The conditions for dynamic recrystallization of metals in shock waves

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