Influence of attrition milling on nano-grain boundaries

Rawers, J. C.; Cook, Dianne

doi:10.1016/s0965-9773(99)00049-5

Cited by 53 publications

(25 citation statements)

References 39 publications

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“…The second component with B ∼ = 33 T can be attributed to Fe atoms in a perfect locally defect free lattice environment. The third site with hyperfine magnetic field B ∼ = 34 T, and a relative area of 30.5% is comparable to that obtained in the n-Fe milled under Ar atmosphere for 50 h, where its relative area was found to be 8.8% [23]. This difference may be due to the milling conditions.…”

Section: Mössbauer Spectrometrysupporting

confidence: 65%

Structural properties of Fe50Co50 nanostructured powder prepared by mechanical alloying

Moumeni

Alleg

Grenèche

2005

Journal of Alloys and Compounds

101

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Section: Mössbauer Spectrometrysupporting

confidence: 65%

Structural properties of Fe50Co50 nanostructured powder prepared by mechanical alloying

Moumeni

Alleg

Grenèche

2005

Journal of Alloys and Compounds

101

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“…The time dependence of the structural changes is currently being undertaken in greater detail. Meanwhile, with the reduction of grain sizes, dislocations are no longer sustained within the grain and, once generated, rapidly diffuse to the GB [19]. Dislocations do not dissociate when they arrive at GBs but remain as immobile and disordered arrays of GB dislocations adding to the GB disorder and further increasing the local strain [20].…”

Section: Discussionmentioning

confidence: 99%

Localized solid-state amorphization at grain boundaries in a nanocrystalline Al solid solution subjected to surface mechanical attrition

Tao

Hong

et al. 2005

J. Phys. D: Appl. Phys.

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Using high-resolution electron microscopy, localized solid-state amorphization (SSA) was observed in a nanocrystalline (NC) Al solid solution (weight per cent 4.2 Cu, 0.3 Mn, the rest being Al) subjected to a surface mechanical attrition treatment. It was found that the deformation-induced SSA may occur at the grain boundary (GB) where either the high density dislocations or dislocation complexes are present. It is suggested that lattice instability due to elastic distortion within the dislocation core region plays a significant role in the initiation of the localized SSA at defective sites. Meanwhile, the GB of severely deformed NC grains exhibits a continuously varying atomic structure in such a way that while most of the GB is ordered but reveals corrugated configurations, localized amorphization may occur along the same GB.

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“…[24,30] As shown in Figure 5, the lattice parameter of the Ni degassed for 4 hours is essentially the same as the lattice parameter of that degassed for 32 hours. This, along with the fact that the N content of the Ni cryomilled in liquid argon does not decrease with either the degassing time or the decreasing trend of the lattice parameter of the Ni cryomilled in liquid nitrogen, indicates that the N atoms in solid solution are mainly responsible for the greater lattice parameter in the Ni cryomilled in liquid nitrogen than for that in the Ni cryomilled in liquid argon.…”

Section: B Residual Microstrain and Lattice Parameter Via Xrdmentioning

confidence: 67%

Grain Growth in Cryomilled Ni Powder during Degassing

Thornton

Han

Lavernia

2007

Metall Mater Trans A

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Grain growth during the degassing of Ni cryomilled in liquid nitrogen and that cryomilled in liquid argon was investigated by X-ray diffraction (XRD) and confirmed by transmission electron microscopy (TEM) studies. The Ni cryomilled in liquid argon was found to have significantly more thermal stability than the Ni cryomilled in liquid nitrogen, with grain sizes of 28 and 62 nm, respectively, after 32 hours of degassing at 723 K. The Ni cryomilled in liquid argon was found to have significantly greater amounts of aluminum, iron, and chromium than did the Ni cryomilled in liquid nitrogen. The measured grain-growth data conformed very well to the predictions from two models that were derived for impure nanocrystalline materials. That fact, along with the data obtained from chemical analysis, supports the conclusion that the kinetics of grain growth in cryomilled Ni are dominantly controlled by the drag force of impurities on the grain boundaries, as the impurities segregate to the grain boundaries.

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Influence of attrition milling on nano-grain boundaries

Cited by 53 publications

References 39 publications

Structural properties of Fe50Co50 nanostructured powder prepared by mechanical alloying

Structural properties of Fe50Co50 nanostructured powder prepared by mechanical alloying

Localized solid-state amorphization at grain boundaries in a nanocrystalline Al solid solution subjected to surface mechanical attrition

Grain Growth in Cryomilled Ni Powder during Degassing

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