Funct. Mater. 2014; 21 (1): 52-58.

http://dx.doi.org/10.15407/fm21.01.052

Internal friction in Invar Fe-35 % Ni alloy after combined SPD by hydroextrusion and drawing

V.M.Nadutov, D.L.Vashchuk, A.N.Pilipenko[1], O.A.Davidenko[2], V.A.Beloshenko[2]

[1] V.Kurdyumov Institute for Metal Physics, National Academy of Sciences of Ukraine, 36 Bulv. Ac. Vernadskii, 03680 Kyiv, Ukraine
[2] O.O.Galkin Institute for Physics and Engineering, National Academy of Sciences of Ukraine, 72 R.Luxemburg Str., 83114 Donetsk, Ukraine

Abstract: 

The temperature dependence of internal friction on frequency of ~3 Hz and ~60 Hz were studied in Invar Fe-35.0% Ni-0.49% Mn-0.03%C alloy after annealing at 1373 K and combined severe plastic deformation (SPD) by hydroextrusion and subsequent drawing with the total degree of accumulated deformation ε Σ = 4.69. The reduction of the relaxation IF peak intensity is observed in deformed sample of the alloy at ~380 K (the activation energy 0.82-0.93 eV) due to decreasing of mechanical and magnetomechanical relaxation losses the contribution of which is renewed after ageing of the deformed alloy. The damping growth nearby temperatures 780-820 K after combined SPD and partial its reduction after ageing of the alloy were revealed. The estimated activation energy of the relaxation process is 1.82-1.97 eV.

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