The kinetics of disperse order development in α-cual alloys

Varschavsky, A.; Donoso, E.

doi:10.1007/bf02644291

Cited by 16 publications

(2 citation statements)

References 40 publications

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“…The kinetics of ordering in the alloys α-CuAl and Ni 3 Al studied by differential scanning calorimetry (DSC) also show similarities to BZT. In α-CuAl, with 19, 13, and 6.5 wt % Al, a nonisothermal study of the ordering gave E a = 145−178 kJ mol -1 and n = 1.39 . The DSC thermograms show two distinct exothermic reactions.…”

Section: Discussionmentioning

confidence: 98%

High-Temperature Processing of Ba₃ZnTa₂O₉: an In situ Study Using Synchrotron X-ray Powder Diffraction

et al. 2007

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In situ synchrotron X-ray powder diffraction is used to study the kinetics of cation ordering and ordered domain growth in the microwave dielectric electroceramic Ba 3 ZnTa 2 O 9 (BZT) with a time resolution of 15 s and processing temperatures of up to 1500 °C. This permits the measurement of the activation energy for cation ordering and the identification of different mechanisms for ordered domain growth, associated with the formation of the Ba 8 ZnTa 6 O 24 impurity phase due to zinc loss.

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Section: Discussionmentioning

confidence: 98%

High-Temperature Processing of Ba₃ZnTa₂O₉: an In situ Study Using Synchrotron X-ray Powder Diffraction

et al. 2007

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“…Such conditions give rise to larger volume fractions than those corresponding to equilibrium, because of the enhanced nucleation which is assisted by the quenched-in defects. This feature was shown in previous work by the high values of Are computed [23].…”

Section: Equilibrium Attainmentmentioning

confidence: 51%

Ordered domain characterization in α-Cu-Al alloys from dissolution kinetics studies

Varschavsky

Donoso

1986

J Mater Sci

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Through microcalorimetric experiments, disperse order (DO) dissolution kinetics in preannealed e-Cu-AI alloys containing 1 9, 13 and 6.5 at% aluminium were adequately described by the integrated kinetic model function arising from the steady-state part of the diffusion field: f(y) = 1 -(1 -y)2/3. Domain sizes after the annealing treatment, and also critical radii, were determined from differential scanning calorimetry data analysis at different heating rates. The existence of critical radii indicates that the disperse-order dissolution process is a firstorder transition. Nevertheless, it was inferred that for very dilute alloys, only short-range order is present. After pre-annealing the alloys at different temperatures, volume fractions and domain concentrations were computed by employing the above kinetic model under high heating-rate conditions. On the basis of appropriate time constant and diffusion time calculations, the range of such temperatures compatible with equilibrium attainment was established. Prolonged pre-anneals alter the particle distribution, but do not influence either volume fractions or domain sizes. A semi-quantitative particle radius-particle concentration-temperature diagram was proposed for e-Cu-AI alloys.

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Non-isothermal calorimetric determination of precipitate interfacial energies

Varschavsky

1985

J Mater Sci

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The kinetics of disperse order development in α-cual alloys

Cited by 16 publications

References 40 publications

High-Temperature Processing of Ba₃ZnTa₂O₉: an In situ Study Using Synchrotron X-ray Powder Diffraction

High-Temperature Processing of Ba₃ZnTa₂O₉: an In situ Study Using Synchrotron X-ray Powder Diffraction

Ordered domain characterization in α-Cu-Al alloys from dissolution kinetics studies

Non-isothermal calorimetric determination of precipitate interfacial energies

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The kinetics of disperse order development in α-cual alloys

Cited by 16 publications

References 40 publications

High-Temperature Processing of Ba3ZnTa2O9: an In situ Study Using Synchrotron X-ray Powder Diffraction

High-Temperature Processing of Ba3ZnTa2O9: an In situ Study Using Synchrotron X-ray Powder Diffraction

Ordered domain characterization in α-Cu-Al alloys from dissolution kinetics studies

Non-isothermal calorimetric determination of precipitate interfacial energies

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Product

Resources

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High-Temperature Processing of Ba₃ZnTa₂O₉: an In situ Study Using Synchrotron X-ray Powder Diffraction

High-Temperature Processing of Ba₃ZnTa₂O₉: an In situ Study Using Synchrotron X-ray Powder Diffraction