Influence of disperse particles on internal friction of pure iron

A. Mikeladze, A. Gachechiladze, T. Badzoshvili, V. Badzoshvili (Institute of metallurgy and materials science)

ABSTRACT

The present paper is aimed at the investigation of the temperature spectrum and amplitude-dependent internal friction (ADIF) of carbonless pure iron containing disperse inclusions of aluminium and iron oxides. The internal friction was measured on wire specimens using low-frequency vacuum relaxator of the inverse pendulum type. Saturated magnetic field with the intensity H = 800Oe was applied to the specimen. The experimental results show that the disperse particles alter considerably the temperature spectrum of pure iron internal friction. An asymmetric maximum of the acoustic oscillation energy absorption with the parameters H = 1.2eV, w₀ = 5*10¹¹s^-1 is observed in the vicinity of 200°C. An attenuation maximum connected with the interaction of dislocations with “strong” and “weak” pinning obstacles is observed in the curves of amplitude-dependent internal friction above 200°C at the deformations e~ 10-4.