Effects of solute and vacancy segregation on migration of a/4〈1 1 1〉 and a/2〈1 0 0〉 antiphase boundaries in Fe3Al

Koizumi, Yuichiro; Allen, Samuel M.; Minamino, Yoritoshi

doi:10.1016/j.actamat.2009.03.012

Cited by 18 publications

(25 citation statements)

References 31 publications

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“…Since the details of the phase-field model we developed are available in the previous papers [16,17], only the characteristics of our model are briefly described here. The model we developed is based on the Bragg-Williams model.…”

Section: Methodsmentioning

confidence: 99%

“…This deviation may be due to some segregation. For shedding light on the effects of vacancy segregation, we developed a phase-field model in which local vacancy concentration was taken into account [16,17]. In the latest study [17], we performed simulations of APB migration in the stoichiometric Fe 3 Al, and found that the migration of B2-APB and D0 3 -APB were affected by solute and vacancy segregation in different manners [17].…”

Section: Introductionmentioning

confidence: 99%

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Effects of solute and vacancy segregation on antiphase boundary migration in stoichiometric and Al-rich Fe3Al: A phase-field simulation study

et al. 2010

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Effects of segregation of solute atoms and vacancies on migration of antiphase domain boundaries (APDBs) in stoichiometric and Fe 3 Al at 673 K have been studied using a phase-field method in which local vacancy concentration is taken into account [Koizumi Y, Allen SM, MinaminoY. Acta Mater 2008;56:5861, ibid. 2009;57;3039]. Boundary mobility (M) of APBs having different phase-shift vectors of a/4<111> and a/2<100> (hereafter denoted as B2-APB and D0 3 -APD, respectively) were evaluated by measuring the boundary velocity of shrinking circular APDs. Similar effects of the segregations on the migration of B2-APBs were observed in both compositions. Vacancies segregated and Al-atoms were depleted at B2-APBs in both compositions. Vacancy concentration at B2-APBs was up to 80 % higher than those in the bulk. As a result, the migration of B2-APBs was greatly enhanced by the vacancy segregation. In contrast, the segregations to D0 3 APBs greatly depended on the composition. Vacancies are depleted and Al-atoms segregated at D0 3 -APBs in the Al-rich Fe 3 Al, whereas vacancies segregated and Al-atoms were depleted at D0 3 -APB in the stoichiometric Fe 3 Al. The Al segregation in the Al-rich Fe 3 Al decreased the M of D0 3 -APB s much more significantly than the Al-depletion in the stoichiometric Fe 3 Al. As the APDs shrank, D0 3 -APBs broke away from the segregation atmospheres and the Ms increased rapidly in both compositions. A greater increase in the M due to the breakaway was observed in the Al-rich Fe 3 Al than in the stoichiometric one.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of solute and vacancy segregation on antiphase boundary migration in stoichiometric and Al-rich Fe3Al: A phase-field simulation study

et al. 2010

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“…Here, only the characteristics of our model are briefly described since the details of the phase-field model we developed are available in the previous papers [16,17]. The model is based on the Bragg-Williams model.…”

Section: Methodsmentioning

confidence: 99%

“…This deviation may arise from some segregation. To shed light on the effects of vacancy segregation, we developed a phase-field model in which local vacancy concentration was taken into account [16,17]. We found that the migration of B2-APB and D0 3 -APB in Fe 3 Al were affected by solute and vacancy segregation in different manners [17].…”

Section: Introductionmentioning

confidence: 99%

“…To shed light on the effects of vacancy segregation, we developed a phase-field model in which local vacancy concentration was taken into account [16,17]. We found that the migration of B2-APB and D0 3 -APB in Fe 3 Al were affected by solute and vacancy segregation in different manners [17]. We have demonstrated that the segregation trend depends on the alloy composition [16] and the effect of segregation on APB migration in an Al-rich Fe 3 Al (Fe-28at%Al) quite significantly differs from that in the stoichiometric alloy [18].…”

Section: Introductionmentioning

confidence: 99%

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Phase-Field Simulation of Antiphase Boundary Migration in Slightly Off-stoichiometric Fe<sub>3</sub>Al with Solute and Vacancy Segregation

Ouchi

Minamino

Allen

2010

Trans. Mat. Res. Soc. Japan

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Effects of segregation of solute atoms and vacancies on migration of antiphase boundaries (APBs) in Fe 3 Al with slightly off-stoichirometric (Fe-24 and 26Al) compositions (unit: at%) at 673 K have been studied by a phase-field method in which local vacancy concentration is taken into account [Koizumi et al. Acta Mater 2008;56:5861, ibid. 2009;57:3039], and results were compared to those for stoichiometric and far Al-rich compositions obtained in the previous study. Shrinking of circular APBs having different phase-shift vectors of a/4<111> and a/2<100> (B2-APB and D0 3 -APB, respectively) were simulated and their boundary mobilities were evaluated. Similar effects of the segregation on the migration of B2-APBs were observed for all the compositions, that is, vacancies segregated and Al-atoms were depleted at B2-APBs. Vacancy concentration at B2-APBs was up to 80 % higher than that in the bulk, which enhanced the migration of B2-APBs greatly. In contrast, the segregation to D0 3 -APBs exhibited a marked composition dependence. Vacancies are depleted and Al-atoms segregated at D0 3 -APBs in Fe-28Al, whereas vacancies segregated and Al-atoms were depleted at D0 3 -APB in Fe-24Al and Fe-25Al. Almost no segregation was observed in Fe-26Al. Solute-drags suppressed the migration of D0 3 -APBs in Fe-24Al and in Fe-28Al, and the breakaway of APBs from their segregation atmosphere increased their boundary mobilities by almost one order of magnitude.

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The annihilation kinetics of the nanoscale antiphase domain boundary in B2 alloys: phase field characterization at the atomistic level

Wang

2019

J Mater Sci

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Effects of solute and vacancy segregation on migration of a/4〈1 1 1〉 and a/2〈1 0 0〉 antiphase boundaries in Fe3Al

Abstract: Effects of segregation of solute atoms and vacancies on migration of a/4<111> and a/2<100>antiphase domain boundaries (APDBs) in stoichiometric Fe 3 Al at various temperatures are studied using a phase-field model [Koizumi et al., Acta Mater. 2008;56:5861]

Cited by 18 publications

References 31 publications

Effects of solute and vacancy segregation on antiphase boundary migration in stoichiometric and Al-rich Fe3Al: A phase-field simulation study

Effects of solute and vacancy segregation on antiphase boundary migration in stoichiometric and Al-rich Fe3Al: A phase-field simulation study

Phase-Field Simulation of Antiphase Boundary Migration in Slightly Off-stoichiometric Fe<sub>3</sub>Al with Solute and Vacancy Segregation

The annihilation kinetics of the nanoscale antiphase domain boundary in B2 alloys: phase field characterization at the atomistic level

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