Investigation of Defects and Atomic Ordering in Fe72Al28 by Positron Annihilation and Mössbauer Spectroscopy

Jirásková, Y.; Schneeweiss, O.; Šob, Mojmı́r; Νovotný, I.; Procházka, I.; Bečvář, F.; Sedlák, B.; Šebesta, F.; Puska, Martti J.

doi:10.1051/jp4:1995118

Cited by 7 publications

(5 citation statements)

References 1 publication

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“…perfect D0 3 -ordered structure, consistent with the preferential occupation of vacancies revealed by Mössbauer spectroscopy [36]. Then, the probabilities of finding vacancies on α, β, γ and δ sites are defined as follows:…”

Section: Description Of Free Energy Of Vacancy Containing Fe 3 Al By mentioning

confidence: 97%

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

2009

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Section: Description Of Free Energy Of Vacancy Containing Fe 3 Al By mentioning

confidence: 97%

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

2009

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“…For calculating the probability of finding aluminum, the site fraction of aluminum atoms instead of Al concentration was used taking into account the vacancies. The probability of finding vacancy was defined as a function of B2-LRO for reproducing the experimental fact that vacancies preferentially occupy Fe-sites in the nearest neighbor of Al-atom in B2-type ordered structure [18]. Internal energy was calculated by using two-body interaction energy given in the literature [19].…”

Section: Methodsmentioning

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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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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“…For calculating the probability of finding aluminum, the site fraction of aluminum atoms instead of Al concentration was used taking into account the vacancies. The probability of finding a vacancy was defined as a function of B2-LRO for reproducing the experimental fact that vacancies preferentially occupy Fe-sites in the nearest neighbor of Al-atom in B2-type ordered structure [19]. Internal energy was calculated by using two-body interaction energies given in the literature [20].…”

Section: Methodsmentioning

confidence: 99%

Phase-Field Simulation of Antiphase Boundary Migration in Slightly Off-stoichiometric Fe3Al 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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Investigation of Defects and Atomic Ordering in Fe₇₂Al₂₈ by Positron Annihilation and Mössbauer Spectroscopy

Cited by 7 publications

References 1 publication

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

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

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

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