Condition of Boron in α-Iron
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概要
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The question as to whether boron forms an interstitial or a substitutional solid solution in α-iron is of considerable interest. Measurements have been made, of the solubility and diffusivity of boron in both α and γ-iron of the lattice parameter change of boron treated iron due to heat treatments, and these results suggest that boron behaves substitutionally. The calculation based on estimates of the atomic radius of boron also suggests that boron may be substitutional in α-iron. On the other band, there have also been some evidence based on the measurements of internal friction that boron is interstitial in α-iron. These evidences however are contradictory with each other and they aren not sufficiently conclusive. The authors made internal friction measurements, and obtained the results suggesting that boron behaves in α-iron both as interstitial and substitutional. Measurements were carried out by the method of a torsion pendulum (in the magnetic field of about 150 Oe.). The frequency employed was varied from 1 to 5cps, and the temperature range was -40℃〜100℃. Specimens were prepared in the following way. Polycrystalline wires ("Puron" 1 mm and 0.8 mm diameter) were decarburized, denitrided in flowing wet hydrogen atmosphere. Next, these wires were annealed with powdered boron (99%-B) in an atmosphere of dry hydrogen at 900℃ for about 30 hrs and boron diffused in the matrix from the surface layer. Finally the surface layer was removed by polishing. The resulting specimens contained about 0.01 wt-% of boron. (by chemical analysis).
- 社団法人日本物理学会の論文
- 1964-07-05
著者
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Sugeno Takesi
Department Of Applied Physics Faculty Of Engineering University Of Tokyo
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Sugeno Takesi
Department Of Applied Physics University Of Tokyo
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HAYASHI Yasnori
Department of Applied Physics, University of Tokyo
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Hayashi Yasnori
Department Of Applied Physics University Of Tokyo
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