| Numéro |
J. Phys. Colloques
Volume 48, Numéro C8, Décembre 1987
Fifth European Conference on Internal Friction and Ultrasonic Attenuation in Solids
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|---|---|---|
| Page(s) | C8-233 - C2-237 | |
| DOI | https://doi.org/10.1051/jphyscol:1987832 | |
J. Phys. Colloques 48 (1987) C8-233-C2-237
DOI: 10.1051/jphyscol:1987832
A COMMENT ON THE 87°C I.F. PEAK IN Fe-V-N ALLOYS
TINGGUO CHEN, XIAOMING XIE et ZILIANG WUShanghai Institute of Metallurgy, Academy of Sciences of China, Shanghai, China 200050
Abstract
It is shown in the present paper that the 87°C internal
friction peak in the Fe-V-N system often refered to in the literature does not
behave like an s-i interaction peak. It is induced by the nitrogen atoms
accupying the anion hole of a defective vanadium nitride precipitate. The
effective holes capable of holding interstitials for internal friction
generation must be situated in the interface between the α-Fe matrix and the
defective precipitate. The 95°C peak occurs for a precipitate with a N/V ratio
of 0.7 to 0.8, corresponding to the metastable compound V4
N3 of of highest hole concentration. Lattice parameter measurements
show that a stoichiometric VN precipitate with ao=4.13Å produce no
95°C peak while a defective VN0.69 with ao=4.08Å can give
95°C peak.