Effect of excess Au on antiphase domain growth in Cu3Au

The progressive ordering of a single crystal of Ni4Mo by isothermal ageing at 650°C (transformation temperature = 868°C) has been studied by x-ray line broadening techniques using the Warren- Averbach method employing computer techniques. The long-range-order parameter, antiphase domain size, and internal strains were measured as a function of ordering time and compared with those previously obtained at 700°C. The activation energies for domain growth and ordering were found to be 91 kcal/mole and 44.5 kcal/mole respectively. The rms strain developed during ordering was found to be dependent on the degree of tetragonality of the structure.

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Kinetics of antiphase domain growth

Acta Metallurgica ◽

10.1016/0001-6160(68)90138-7 ◽

1968 ◽

Vol 16 (5) ◽

pp. 657-666 ◽

Cited By ~ 37

Author(s):

S.G Cupschalk ◽

N Brown

Keyword(s):

Antiphase Domain ◽

Domain Growth ◽

Kinetics Of

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Effect of Excess Vacancies on Antiphase Domain Growth in Fe3Al

MRS Proceedings ◽

10.1557/proc-842-s5.20 ◽

2004 ◽

Vol 842 ◽

Cited By ~ 2

Author(s):

Y. Koizumi ◽

T. Hagiwara ◽

Y. Minamino ◽

N. Tsuji

Keyword(s):

Isothermal Annealing ◽

Early Stage ◽

Vacancy Concentration ◽

Antiphase Domain ◽

Rapid Decrease ◽

Experimental Results ◽

Domain Growth ◽

Parabolic Growth ◽

Quenching Process ◽

Non Equilibrium

ABSTRACTThe growth of the D03-type antiphase domain (APD) in Fe3Al was investigated focusing on the effect of excess vacancies that were introduced during the quenching process from the disordered state. The variation in the APD size exhibited considerable deviation from the conventional “parabolic growth law” in the early stage of APD growth. This variation was numerically calculated on the assumption that the migration of the APD boundaries was enhanced by non-equilibrium excess vacancies and the vacancy concentration decreased during the isothermal annealing for the APD growth. The calculated variations in the APD size could be successfully fitted to the experimental results in cases with quenching temperatures (Tq) of 873 K or 1073 K, but not when Tq was 1273 K. The APD growth in the latter case was much slower than the expected growth derived from the calculation. This discrepancy was attributed to the rapid decrease in the vacancy concentration due to vacancy clustering since a significant amount of dotted contrasts were observed in TEM image of only the specimen quenched from 1273K.

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