Conclusions
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1.
The critical shear stress temperature dependence for Al−Mg single crystal alloys and for Al crystals had three regions in the studied temperature range: (a) 300−(120–130)°K, in which the CSS is temperature independent; (b) 120−4.2°K, in which the CSS rises with falling temperature (the temperature T0, above which τ = τG, slightly shifting to lower temperatures side with increasing Mg content in the alloy); and (c) below 4.2°K, for which the CSS decreases with decreasing temperature.
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2.
The magnitude of the critical shear stress in the studied temperature and concentration ranges is proportional to √c and is described satisfactorily using Fleischer's concepts of edge dislocation interaction with the maximum elastic stress fields and localized shear modulus concentration variations.
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3.
The absolute fall in the CSS at temperatures below 4.2°K rises proportionally to √c, its relative value not depending on the alloy Mg concentration.
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Additional information
Physicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar'-kov. Translated from Problemy Prochnosti, No. 8, pp. 61–65, September, 1972.
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Podkuiko, V.P., Pustovalov, V.V., Roitman, L.U. et al. Critical shear stress temperature dependence in Al−Mg single crystal alloys of various concentrations in the range 1.6–300°K. Strength Mater 4, 963–967 (1972). https://doi.org/10.1007/BF01529696
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DOI: https://doi.org/10.1007/BF01529696