Abstract
The temperature and strain rate dependences of the critical resolved shear stress of bismuth single crystal are investigated by compression tests for two slip systems, (111) <11̄0> and {001} <1̄1̄0>, over the temperature range from 77 K to 538 K. From the results the activation energy U0 and the activation volume of dislocation motion for each slip system are determined. They are 0.1 eV and 2×10-19 cm3 for the (111) <11̄0> slip system, 0.4 eV and 0.06×10-19 cm3 for the {001} <1̄1̄0> slip system, respectively. It is concluded that for the (111) <11̄0> slip system the main obstacle to moving dislocations is the forest dislocation, and for the {001} <1̄1̄0> slip system the Peierls potential controls the slip mechanism.
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