Conclusions
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1.
The temperature and rate dependences of τ c in Mg single crystals were determined for basal slip in the temperature range −196 to +27°C and for rates 8·10−4 to 2·10−2 sec−1, respectively.
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2.
The thermodynamical parameters characterizing the τ c temperature and rate dependence were found. It was shown that the activation volume increased gradually from 10−20 to 3.5·10−20 cm3 in the temperature range −196 to +27°C. The potential barrier height was 5·10−2 eV.
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3.
An analysis of the obtained results and the electron microscopic data indicate that the mechanism governing τ c is the surmounting of local defect impurities by the dislocations.
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4.
It is shown that the deformation hardening curves in the temperature range −196 to +27°C can be represented in two stages, A and B.
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Additional information
Physicotechnical Institute of Low Temperature, Academy of Sciences of the Ukrainian SSR, Khar'kov. Translated from Problemy Prochnosti, No. 10, pp. 60–64, October, 1972.
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Lavrent'ev, F.F., Pokhil, Y.A. & Startsev, V.I. Critical shear stress temperature and rate dependence in magnesium single crystals. Strength Mater 4, 1216–1220 (1972). https://doi.org/10.1007/BF01527963
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DOI: https://doi.org/10.1007/BF01527963