A universal relation for the stress dependence of activation energy for slip in body-centered cubic crystals

作者：Ngan AHW^*; Zhang HF

来源：Journal of Applied Physics, 1999, 86(3): 1236-1244.

DOI：10.1063/1.370877

By analyzing experimental data in the literature, the activation energy H for slip in body-centered cubic metals is found to approximately obey the simple relation H approximate to 0.1 mu b(3) (1 - t)(2), where t is the applied stress normalized by the zero-temperature Peierls stress, mu is the [111] shear modulus, and b the 1/2[111] Burgers vector. Such universal relation is explained by analyzing the activation processes of kink- pair generation and expansion along threefold screw dislocations using the generalized Peierls-Nabarro model [A. H. W. Ngan, J. Mech. Phys. Solids 45, 903 (1997)]. The model also predicts qualitatively the general form of the orientation dependence of Peierls stress at zero temperature.

• 出版日期1999-8-1
• 单位香港大学