Quenched-in vacancies in B2-structured intermetallic compound FeAl

Kogachi, Mineo; Haraguchi, Tadao

doi:10.1016/s0921-5093(97)00016-6

Cited by 103 publications

(43 citation statements)

References 16 publications

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“…The average lattice parameter estimated by the XRD peak analysis is approximately 0.28992 nm with the error of better than ±6 × 10 −5 nm. This value is much smaller than those of fully-annealed FeAl at the similar compositions reported in previous studies, 8,[16][17][18] suggesting a high vacancy concentration. Assuming that (i) a half of the excess Fe atoms over the stoichiometric com-position (Fe : Al = 1 : 1) are displaced into the Al sublattice and (ii) that there are no Al atoms displaced into the Fe sublattice, we calculate the density of the ribbons as being approximately 5.845 × 10 −3 g/mm 3 based on the lattice parameter.…”

Section: Resultsmentioning

confidence: 38%

“…This value is much closer to those of fully-annealed Fe-45 mol%Al. 8,16,18) This indicates that the concentration of the supersaturated vacancies is greatly decreased by the heat treatment. Figure 2 shows SEM images of surfaces of the pre-and post-heated ribbons.…”

Section: Resultsmentioning

confidence: 99%

“…[3][4][5] Most of the thermal vacancies in the FeAl alloys can be readily frozen-in by quenching the alloys from the high temperatures. [6][7][8] The supersaturation of the vacancies can lead to their binding into divacancies as predicted by theoretical calculation 9) and further clustering into higherorder vacancy complexes and extended defects as observed from experiments. 7,[10][11][12][13] The purpose of this study is to investigate clustering behavior of the supersaturated vacancies, and change in surface nanostructure due to the phenomenon in B2 FeAl using rapidly solidified ribbons.…”

Section: Introductionmentioning

confidence: 86%

“…The peak positions observed were numerically analyzed and determined by the curve fitting software "PRO-FIT", 8) and then the lattice parameter was determined by extrapolating the Nelson-Riley function towards θ = 90…”

Section: Methodsmentioning

confidence: 99%

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Nanoporous Surfaces of FeAl Formed by Vacancy Clustering

et al. 2002

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Numerous thermal vacancies are frozen into FeAl B2-ordered alloy ribbons by a conventional rapid-solidification technique. Through heat treatment at 723 K, clustering of the supersaturated vacancies generates a large number of nanopores, particulary near surfaces, thus creating nanoporous surfaces. The nanoporous surface structure was confirmed by scanning electron microscopy and atomic force microscopy. The behavior of this vacancy clustering was examined by differential scanning calorimetry. An exothermic, irreversible peak, probably due to vacancy clustering, was observed around 800 K, giving an activation evergy of about 1.17 eV. The nanopore formation was also observed by in-situ heating experiments in a transmission electron microscope. The pores have specific morphology and crystallography with pore surfaces faceting toward {100} planes. These results suggest that the vacancy clustering is a unique process which enables us to efficiently make nanoporous surfaces.

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Section: Resultsmentioning

confidence: 38%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 86%

Section: Methodsmentioning

confidence: 99%

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Nanoporous Surfaces of FeAl Formed by Vacancy Clustering

et al. 2002

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“…[1][2][3][4][5][6] In our recent work on Fe-45 mol%Al ribbons, it was revealed that supersaturated vacancies retained upon rapid solidification were absorbed near the surface during an aging heat treatment. Following this, the surface morphology was self-patterned on a nano-to meso-scale.…”

Section: Introductionmentioning

confidence: 99%

Surface Oxidation of Fe-48 mol%Al Single Crystal under a High Vacuum

et al. 2004

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In order to investigate the effect of aging heat treatment and surface orientation on oxidation during the nanopore formation of B2-type FeAl, the surface of Fe-48 mol%Al single crystal was analyzed by Auger Electron Spectroscopy (AES). Electropolished and plasma-cleaned surfaces were aged for 18 ks at 723 K, in vacuum (about 5 Â 10 À4 Pa). A thin oxide layer was already formed on the non-aged surface. A thicker oxide layer was grown on the aged surface, but the difference in thickness of the oxide layers was slight. Further, the orientation dependence of the thickness of the oxide layers was even smaller. The thickness of the oxide layer on the FeAl single crystal is comparable to that of the passive film on the aluminum foil. Therefore, it is concluded that the influence of the aging heat treatment on oxidation during the nanopore formation of B2-type FeAl is negligible.

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Phonon Thermodynamics of Binary Fe Alloys

Lucas

2011

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Quenched-in vacancies in B2-structured intermetallic compound FeAl

Cited by 103 publications

References 16 publications

Nanoporous Surfaces of FeAl Formed by Vacancy Clustering

Nanoporous Surfaces of FeAl Formed by Vacancy Clustering

Surface Oxidation of Fe-48 mol%Al Single Crystal under a High Vacuum

Phonon Thermodynamics of Binary Fe Alloys

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