Equilibrium and Kinetics of Thermal Ordering or Disordering in Ni3Al

Dimitrov, C.; Tarfa, T.; Dimitrov, O.

doi:10.1007/978-94-011-2886-5_13

Cited by 11 publications

(5 citation statements)

References 8 publications

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“…2. According to the path probability method [44], corroborated by many experimental results [45,46,47,48,49], the isothermal relaxation of the LRO parameter in intermetallics is well fitted with two exponentials, yielding a long and a short relaxation times, corresponding to the slow and the fast processes, respectively. This result is well established in L1 2 phase for which a detailed study has shown that the fast process is related to the formation of the nearest-neighbour antisite pairs, whereas the slow one is related to the uncoupling of these antisite pairs [40].…”

Section: Resultsmentioning

confidence: 86%

Saddle-point energies and Monte Carlo simulation of the long-range order relaxation in CoPt

Allalen

Bouzar²,

Mehaddene³

2005

Eur. Phys. J. B

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Abstract. We present atomic-scale computer simulations in equiatomic L10-CoPt where Molecular Dynamics and Monte Carlo techniques have both been applied to study the vacancy-atom exchange and kinetics relaxation. The atomic potential is determined using a Tight-Binding formalism within the Second-Moment Approximation. It is used to evaluate the different saddle-point energies involved in a vacancy-atom exchange between nearest-neighbour sites. The potential and the saddle-point energies have been used to simulate the relaxation of the long-range order in CoPt using a Monte Carlo technique. A vacancy migration energy of 0.73 ± 0.15 eV and an order-disorder transition temperature of 935 K have been found. PACS

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Section: Resultsmentioning

confidence: 86%

Saddle-point energies and Monte Carlo simulation of the long-range order relaxation in CoPt

Allalen

Bouzar²,

Mehaddene³

2005

Eur. Phys. J. B

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“…This model has been successfully applied to various binary [17][18][19][20][21][22] and ternary alloys [23]. In the present work, we apply the Rossiter formalism to the order-disorder transitions in Cu-Al-Be; the main parameters of the model are determined from the experimental results, and the evolution with temperature of the lro degree is calculated.…”

Section: Introductionmentioning

confidence: 99%

“…(a) Resistivity against temperature for Cu-48 at.% Zn; (b) evolution of the order parameter S as calculated from resistivity data (black dots) and from neutron scattering[20] (open circles).…”

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confidence: 99%

Influence of Be addition on order–disorder transformations in β Cu–Al

2008

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“…(i) (dρ/dS) 0 . For the order-dependent residual electrical resistivity in a long-range ordered alloy, a generalized version (Dimitrov et al 1992c) of the relationship given by Rossiter (1980) was used:…”

Section: (A) Theoretical Evaluation Of Disordering Induced By Irradia...mentioning

confidence: 99%

Radiation-induced defects in electron-irradiated compounds: the effect of composition

Sattonnay¹,

Dimitrov²,

Dimitrov

1997

J. Phys.: Condens. Matter

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The radiation damage produced at 21 K by 2.5 MeV electrons, and the subsequent recovery have been investigated for intermetallic compounds (50 - 54.5 at.% Al) by means of residual electrical resistivity measurements, with particular emphasis on the effects of the composition and fluence. The resistivity damage rate was much higher for the alloys than for a simultaneously irradiated nickel reference sample. Disordering contributes only a small fraction (8 - 15%) to the resistivity damage. The analysis of the dominant defect contribution led to Frenkel-pair resistivity values of , larger than those for pure Al or Ti, and nearly independent of the composition. The recovery of the damage was characterized by two main stages. The temperature of the first one is independent of the composition: it was assigned to close-pair recombination, and to the migration and annihilation of self-interstitials. The second main one (, for the stoichiometric compound) has a temperature which depends on the fluence and on the composition. It corresponds to the migration and elimination of vacancies. An activation enthalpy of was estimated for this stage for stoichiometric TiAl. Its shift to higher temperatures with increasing aluminium content indicates a reduction in the vacancy mobility.

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Equilibrium and Kinetics of Thermal Ordering or Disordering in Ni3Al

Cited by 11 publications

References 8 publications

Saddle-point energies and Monte Carlo simulation of the long-range order relaxation in CoPt

Saddle-point energies and Monte Carlo simulation of the long-range order relaxation in CoPt

Influence of Be addition on order–disorder transformations in β Cu–Al

Radiation-induced defects in electron-irradiated compounds: the effect of composition

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