Self-Diffusion in High Purity Fe-50 mass%Cr Alloy

Sugihara, M.; Yamazaki, Yoshihiro; Takaki, S.; Abiko, K.; Iijima, Yoshiaki

doi:10.2320/matertrans1989.41.87

Cited by 17 publications

(10 citation statements)

References 4 publications

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“…In 1999, we have presented the volume self-diffusion of 51 Cr and 59 Fe in a high-purity Fe-50 mass% Cr alloy in the temperature range between 923 and 1273 K [2]. Linear Arrhenius relations for the volume self-diffusion of both components in the alloy have been observed across the transformation temperature of the s-phase, suggesting that there is little, if any, s-phase in the alloy and that it gives negligible influence on the volume diffusion.…”

Section: Introductionmentioning

confidence: 99%

Volume and Grain-Boundary Self-Diffusion in a High-Purity Fe-50 mass% Cr Alloy

Yamazaki

Sugihara

Takaki

et al. 2002

phys. stat. sol. (a)

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Volume and grain-boundary self-diffusion coefficients of 51 Cr and 59 Fe in a high-purity Fe-49.7 mass% Cr alloy containing 13 mass ppm carbon and 6 mass ppm nitrogen have been determined in the temperature range between 923 and 1453 K by use of the sputter-microsectioning technique. Linear Arrhenius lines for volume self-diffusion coefficients of both tracers have been observed across the a-s phase-transformation temperature 1103 K, which is consistent with the suppression of the formation of the s-phase by purification. The Arrhenius equations can be expressed by D Fe ¼ 1:2 Â 10 À4 expðÀ256 kJ mol À1 =RTÞ m 2 s À1 and D Cr ¼ 1:3 Â 10 À4 exp ðÀ259 kJ mol À1 =RTÞ m 2 s À1 . Downward curved Arrhenius lines for the grain boundary diffusivity adD gb (s segregation factor, d width of grain boundary, and D gb grain boundary diffusion coefficient) of both tracers have been observed. This is attributed to the formation of very thin layer of the (Cr, Fe) 23 C 6 phase at the grain boundary near the surface of the specimens.

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Section: Introductionmentioning

confidence: 99%

Volume and Grain-Boundary Self-Diffusion in a High-Purity Fe-50 mass% Cr Alloy

Yamazaki

Sugihara

Takaki

et al. 2002

phys. stat. sol. (a)

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“…The chemical composition of the alloy is shown in Table 1 in comparison with that of the high purity Fe-50Cr alloy used in a previous work. 6,7) The ingot was hot-forged and hot-rolled at 1373 K in an argon atmosphere to a rod 14 mm in diameter. Specimens of 12 mm in diameter and 1.5 mm in thickness were machined from the rod.…”

Section: Methodsmentioning

confidence: 99%

“…parison with those in the Fe-50Cr alloy. 6,7) The diffusion coefficients of both components in the Fe-50Cr-8W alloy take nearly equal values in the temperature range examined. However, both the values in the alloy are smaller than those in the high purity Fe-50Cr alloy.…”

Section: Volume Diffusion Of Cr and Fe In High-purity Fe-mentioning

confidence: 99%

“…5) Then, we have presented the volume and grain boundary diffusion of 51 Cr and 59 Fe in a high purity Fe-50 mass%Cr alloy in the temperature range between 923 and 1453 K. 6,7) Linear Arrhenius relations for the volume diffusion of both components in the alloy have been observed across the transformation temperature of the σ phase, suggesting that the σ phase was barely formed in the alloy and that it gives negligible influence on the volume diffusion. However, Arrhenius * Graduate Student, Tohoku University.…”

Section: Introductionmentioning

confidence: 99%

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Diffusion of Cr and Fe in a High-Purity Fe-50 mass%Cr-8 mass%W Alloy

et al. 2002

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Volume and grain boundary diffusivities of 51 Cr and 59 Fe in a high purity Fe-50 mass%Cr-8 mass%W (Fe-50Cr-8W) alloy have been determined in the temperature range between 1023 and 1373 K with the sputter-microsectioning technique. The volume diffusion coefficients of Cr and Fe in the Fe-50Cr-8W alloy are smaller than those in a high-purity Fe-50 mass%Cr (Fe-50Cr) alloy. Linear Arrhenius lines for the volume self-diffusion coefficients of both tracers have been observed in the temperature range examined. The activation energies for the volume diffusion of both components in the Fe-50Cr-8W alloy are somewhat smaller than those in the Fe-50Cr alloy. On the other hand, the grain boundary diffusivities of Cr and Fe in the Fe-50Cr-8W alloy at 1123 K are about two orders of magnitude smaller than those in the Fe-50Cr alloy.

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“…[1][2][3][4][5] In order to assess the purity, it is necessary to determine the trace elements included in them. For determination of trace elements in high-purity metals and alloys, it is often necessary to separate and pre-concentrate the trace elements before determination.…”

Section: Introductionmentioning

confidence: 99%

Chemical Form of Precipitate by Coprecipitation with Palladium for Separation of Trace Elements in High-Purity Metals

et al. 2002

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The reductive coprecipitation with palladium has been reported for separation and pre-concentration of trace elements in high-purity metals. In order to evaluate the chemical forms of precipitate by this method, precipitates from acidic solution containing Se, Te, Au, Ag and Pd (only or mixture) were produced under the condition of quantitative precipitation and measured by X-ray diffraction and electron diffraction. The precipitates from solutions including single element were confirmed by X-ray diffraction or electron diffraction. In measurement of Te and Pd precipitate, X-ray diffraction peaks of each element were increase as leaving time lengthens. In measurement of Se precipitate, no X-ray diffraction patterns were found independent of leaving time in the acidic solution. But when leaving time was 24 h, electron diffraction spots of Se were found. The precipitates from solutions including mutual elements (mixture of Pd and the other elements (Se, Te, Au and Ag)) were confirmed by X-ray diffraction or electron diffraction. In measurement of Pd-Au or Pd-Ag precipitate, these elements were respectively precipitated as elementary substance. However, in measurement of Pd-Se or Pd-Te precipitate, it was found that palladium selenide (Pd x Se y ) or palladium telluride (Pd x Te y ) was product.

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Self-Diffusion in High Purity Fe-50 mass%Cr Alloy

Cited by 17 publications

References 4 publications

Volume and Grain-Boundary Self-Diffusion in a High-Purity Fe-50 mass% Cr Alloy

Volume and Grain-Boundary Self-Diffusion in a High-Purity Fe-50 mass% Cr Alloy

Diffusion of Cr and Fe in a High-Purity Fe-50 mass%Cr-8 mass%W Alloy

Chemical Form of Precipitate by Coprecipitation with Palladium for Separation of Trace Elements in High-Purity Metals

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