Diffusion and Stress in Tungsten; Different Time Scales
The Darken method is used to evaluate and compare different time scales in an ideal crystal lattice. The crystalline tungsten exemplifies presented approach. It is shown that in this metal and at 1273 K the time scales differ by nine orders of magnitude. Particular emphasis is given to the problem of deformation, the temperature and the mass diffusion time scales in tungsten quasicontinuum. The transport process in the nonuniform temperature and stress field is characterized by representative velocities. These velocities allow to quantify the time and length scales and can be used for the proper non-dimensialization and effective solution of the particular transport problems.
Andreas Öchsner and José Grácio
M. Danielewski and B. Wierzba, "Diffusion and Stress in Tungsten; Different Time Scales", Defect and Diffusion Forum, Vols. 258-260, pp. 79-84, 2006