Interfacial free volumes in ultra-fine grained metals prepared by severe plastic deformation, by spark erosion, or by crystallization of amorphous alloys

Würschum, Roland; Greiner, W.; Valiev, Ruslan Z.; Rapp, M.; Sigle, Wilfried; Schneeweiss, O.; Schaefer, H.

doi:10.1016/0956-716x(91)90048-6

Cited by 56 publications

(29 citation statements)

References 22 publications

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“…The calculated bulk lifetime agrees well with other calculations (see e.g. [12]) and is slightly lower than the measured bulk lifetime of Ni (108 ps [13]). The same applies to the single vacancy in Ni (measured lifetime 180 ps [14]).…”

Section: Methodssupporting

confidence: 80%

Positron annihilation at grain boundaries in metals

Kuriplach

Melikhova

Hou

et al. 2007

Phys. Status Solidi (c)

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Positron annihilation at selected tilt and twist grain boundaries in iron and nickel is examined theoretically. First the atomic structure of studied perfect and imperfect grain boundaries is obtained using molecular dynamics simulations. Characteristics of positrons trapped at such GBs are then calculated employing the atomic superposition method and are related to free volumes found at GBs. It is observed that in some cases vacancies introduced into ideal grain boundaries do not result in an increase of the positron lifetime.

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Section: Methodssupporting

confidence: 80%

Positron annihilation at grain boundaries in metals

Kuriplach

Melikhova

Hou

et al. 2007

Phys. Status Solidi (c)

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show abstract

“…Indeed, vacancy clusters were detected in metals subjected to severe plastic deformation, e.g. HPT-deformed Cu [8,19,27], Ni [27,28] and Cu deformed by ECAP [29]. On the other hand, no vacancy clusters were detected in conventionally coldrolled Cu [25].…”

Section: Pasmentioning

confidence: 93%

Evolution of defects in copper deformed by high-pressure torsion

Čı́žek¹,

et al. 2011

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“…The Cu-0.1 wt.% Zr alloy could only be characterized by the mean value of the positron lifetime, s ¼ 190 ps in the as-prepared state, due to low statistical accuracy [36]. On the other hand, two positron lifetime components were found in UFG pure Cu, which were attributed to vacancy-type free volumes and nanovoids [37]. The value of s 1 = 171 ps was found in HPT Cu, which was associated with the contribution of numerous interfaces in the material [37].…”

Section: Free Volumes In Ufg Cu-1 Wt%pb Alloymentioning

confidence: 94%

“…For example, UFG Cu and Cu-0.1 wt.% Zr alloy, produced by HPT, have been investigated [36,37]. The Cu-0.1 wt.% Zr alloy could only be characterized by the mean value of the positron lifetime, s ¼ 190 ps in the as-prepared state, due to low statistical accuracy [36].…”

Section: Free Volumes In Ufg Cu-1 Wt%pb Alloymentioning

confidence: 99%