EFFECT OF IMPURITIES ON THE INTERNAL FRICTION SPECTRUM OF MAGNESIUM AFTER PLASTIC DEFORMATION

S. Seyed Reihani , C. Esnouf , Gilbert Fantozzi , G. Revel

We have studied the impurity effect on the internal friction spectrum, with two different samples magnesium 4N and magnesium 6N containing zinc and iron : - for the sample 4N we observe a broad peak depending on the oscillation strain amplitude : this peak shifts towards low temperature when the amplitude increases. - for the sample 6N containing zinc and iron, the internal friction spectrum is different form the one of the 6N sample previously mentioned. After annealing at 250 K we observe, at low strain amplitude, besides the B1and B2peaks, two other peaks situated around 100 and 150 K. But at a high strain amplitude we find the two peaks B1and B2as in the 6N sample. After annealing at 500 K the B1and B2peak are not observed but a large peak appears which shifts towards low temperature with increasing εmThis peak is specific on thermomechanical unpinning of dislocations.

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S. Seyed Reihani, C. Esnouf, Gilbert Fantozzi, G. Revel. EFFECT OF IMPURITIES ON THE INTERNAL FRICTION SPECTRUM OF MAGNESIUM AFTER PLASTIC DEFORMATION. Journal de Physique Colloques, 1981, 42 (C5), pp.C5-145-C5-150. ⟨10.1051/jphyscol:1981522⟩. ⟨jpa-00221064⟩