Thermoactivation Analysis of the Flow-Stress–Temperature Dependence in the F.C.C. Solid Solutions

S. O. Firstov, T. G. Rogul

I.M. Frantsevich Institute for Problems of Materials Sciences, NAS of Ukraine, 3 Academician Krzhizhanovskoho Str., UA-03680 Kyiv-142, Ukraine

Received: 01.11.2016. Download: PDF

The results of thermal-activation analysis of the temperature dependence of the critical shear stress (or the corresponding yield strength) of some pure metals as well as binary and multicomponent solid solutions with the f.c.c. lattice are presented. As shown, the concentration increase of dissolved alloying element leads to both a sharper thermal dependence of critical shear stress component (or component of the corresponding thermal yield strength) on the temperature and an increase of the athermal component for binary and multicomponent solid solutions. The increase in the activation energy of the motion of dislocations and the reduction in the value of the activation volume for binary and multicomponent solid solutions in comparison with the pure metals can be determined by picodimensional distortions of crystal lattice, which are associated with differences in atomic radii of the elements contained in the alloy.

Key words: critical shear stress, yield stress, activation energy for dislocation motion, activation volume.



PACS: 61.72.Hh, 62.20.F-, 62.40.+i, 65.40.De, 81.40.Cd, 81.40.Lm, 83.60.La

Citation: S. O. Firstov and T. G. Rogul, Thermoactivation Analysis of the Flow-Stress–Temperature Dependence in the F.C.C. Solid Solutions, Metallofiz. Noveishie Tekhnol., 39, No. 1: 33—48 (2017) (in Russian)

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