Experimental Investigation on Internal Friction of Fe-Mn-Si Alloy

概要

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Although Fe-Mn-Si alloys are practically used because of their good shape memory effect and their high economical efficiency, their mechanical property has not sufficiently become evident. The internal friction of Fe-Mn-Si alloy was experimentally investigated using the inverted torsion pendulum. A square rod specimen was torsionally vibrated freely with the low frequency over the temperature range from room temperature to 1250℃ and the displacement angle was measured. The attenuation obtained from data exhibits a peak about at 900℃ and that increased with the temperature over 1100℃. Taking into account this phenomenon, I have introduced the theoretical model that the internal friction is due to the grain deformation and the grain boundary sliding. Coupled with the assumption that (1) elastic moduli of the grain and of the grain boundary are insensitive to the temperature, (2) the viscosity of the grain has a peak at one temperature, and (3) the grain boundary phase viscosity decreases with the temperature, this model and measured data enabled us to calculate each shear elastic modulus and the viscosity. In addition, the theoretical attenuation qualitatively agrees with the experimental results, which suggests that this model and used assumptions are suited to describe the characteristic of the internal friction of Fe-Mn-Si alloy.
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