Vacancy Diffusion in Binary Ordered Alloys

Elcock, E. W.; McCombie, Charles

doi:10.1103/physrev.109.605

Cited by 175 publications

(48 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A second extension of the vacancy mechanism for ordered alloys has been postulated by Elcock & McCombie (1958) and Elcock (1959), which would allow diffusion, by motion round certain cyclic vacancy tracks, without creating disorder (Fig, 2:2, after Domian & Aaronson 1964). Each jump of the six jumps in the cycle is a jump to a vacancy at a nearestneighbour site.…”

Section: The Vacancy Mechanismmentioning

confidence: 99%

“…The six-jump cycle was analysed by Elcock & McCombie (1957) and by Elcock (1958) who predicted that the ratio of diffusivities of the two constituent elements in a Csal structure should fall within the limits of 2/3 to 3/2. In strong support of the postulation of such vacancy tracts this ratio has been demonstrated to hold for diffusion in the systems CuZn (Kuper et al 1956), AgMg (Domian & Aaronson 1965) and in AuCd (Huntington et al 1961).…”

Section: The Mechanism Of Diffusion In Nialmentioning

confidence: 99%

See 1 more Smart Citation

Diffusion in the intermetallic compound NiAl

Hancock

McDonnel

1971

Phys. Stat. Sol. (a)

222

View full text Add to dashboard Cite

show abstract

Section: The Vacancy Mechanismmentioning

confidence: 99%

Section: The Mechanism Of Diffusion In Nialmentioning

confidence: 99%

Diffusion in the intermetallic compound NiAl

Hancock

McDonnel

1971

Phys. Stat. Sol. (a)

222

View full text Add to dashboard Cite

show abstract

“…[88][89][90][91] Their formation and interaction energies are therefore valuable for understanding the kinetic processes in NiAl.…”

Section: Thermal Defect Complexesmentioning

confidence: 99%

Constitutional and thermal point defects inB2NiAl

et al. 2000

View full text Add to dashboard Cite

The formation energies of point defects and the interaction energies of various defect pairs in NiAl are calculated from first principles within an order N, locally self-consistent Green's-function method in conjunction with multipole electrostatic corrections to the atomic sphere approximation. The theory correctly reproduces the ground state for the off-stoichiometric NiAl alloys. The constitutional defects ͑antisite Ni atoms and Ni vacancies in Ni-rich and Al-rich NiAl, respectively͒ are shown to form ordered structures in the ground state, in which they tend to avoid each other at the shortest distance on their sublattice. The dominant thermal defects in Ni-rich and stoichiometric NiAl are calculated to be triple defects. In Al-rich alloys another type of thermal defect dominates, where two Ni vacancies are replaced by one antisite Al atom. As a result, the vacancy concentration decreases with temperature in this region. The effective defect formation enthalpies for different concentration regions of NiAl are also obtained.

show abstract

“…Similar conclusions of a complex jump mechanism were arrived at for the Fe 60 Al 40 system 9 on the basis of annealing experiments. 18 Numerous complex jump mechanisms for ordered intermetallic compounds have also been proposed, including a six-jump cycle (Huntington-McCombie-Elock (HME) mechanism), [19][20][21] the antistructure bridge mechanism, 22 and the ␣ sublattice mechanism. 23 …”

mentioning

confidence: 99%

Electric current enhanced defect mobility in Ni3Ti intermetallics

Garay

Glade

Anselmi‐Tamburini

et al. 2004

Applied Physics Letters

209

View full text Add to dashboard Cite

The effect of the application of a dc current on the annealing of point defects in Ni3Ti was investigated by positron annihilation spectroscopy. An increased defect annealing rate was observed under the influence of the current and was attributed to a 24% decrease in the activation energy of mobility. The results are interpreted in terms of the electron wind effect and the complex nature of diffusion in ordered intermetallic phases. They provide direct evidence for an increase in defect mobility in ordered intermetallics under the influence of a current.

show abstract

Vacancy Diffusion in Binary Ordered Alloys

Cited by 175 publications

References 3 publications

Diffusion in the intermetallic compound NiAl

Diffusion in the intermetallic compound NiAl

Constitutional and thermal point defects inB2NiAl

Electric current enhanced defect mobility in Ni3Ti intermetallics

Contact Info

Product

Resources

About