Temperature and Stress Dependence of Mobility of Screw Dislocation in BCC Iron

Abstract:

The Peierls stress and barrier of a screw dislocation in body-centered cubic iron at finite temperature is investigated by using the free energy gradient method. The Peierls barrier is shown to decrease from 12 to 5 meV per unit length of the Burgers vector with increasing temperature from 0 to 400 K. The entropy term of the Peierls barrier is estimated to be 0.2k_B. The Peierls stress also decreases from 900 to 400 MPa with increasing temperature from 0 to 300 K. The change in the Peierls stress due to the entropic effect is larger than that of the Peierls barrier because of thermal softening.

• Periodical: Solid State Phenomena (Volume 258)
• Pages: 17-20
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.258.17
• Online since: December 2016
• Authors: Hideki Mori*
• Keywords: BCC Iron, Free Energy Gradient, Peierls Stress Peierls Barrier, Screw Dislocation

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