Internal Friction of Fe-Co-N and Fe-Ni-N Alloys

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  • Fe-Co-NおよびFe-Ni-N合金の内部摩擦
  • Fe-Co-N オヨビ Fe-Ni-N ゴウキン ノ ナイブ マサツ

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Abstract

Nitrogen diffusion peaks of iron alloys containing less than five atomic pct cobalt or nickel were measured with a torsion pendulum of about Ic/s and with a transverse vibration mode of about 350 c/s. Observed peaks in Fe-Co-N and Fe-Ni-N alloys are very similar to the usual nitrogen peak of unalloyed ferrite. These elements presumably do not sensibly alter the diffusion rate of nitrogen in ferrite.<BR>Precipitation of nitrogen during isochronal annealing was investigated by the internal friction method. The results show that Fe8N phase precipitated in Fe-5 at%Co-N alloy is decreased in considerable amount. This is tentatively interpreted as the indication that the nitrogen concentration equilibrated with Fe8N is increased by the addition of cobalt.

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