A Micromechanical Model of Hardening, Rate Sensitivity and Thermal Softening in BCC Single Crystals

Details A Micromechanical Model of Hardening, Rate Sensitivity and Thermal Softening in BCC Single Crystals A Micromechanical Model of Hardening, Rate Sensitivity and Thermal Softening in BCC Single Crystals

2001-03-13

arxiv.org/abs/cond-mat/0103284v1

Physics

Condensed Matter

Materials Science

27 pages (LaTeX) and 15 Figures (jpg)

Scientific paper

10.1016/S0022-5096(01)00114-4

The present paper is concerned with the development of a micromechanical model of the hardening, rate-sensitivity and thermal softening of bcc crystals. In formulating the model we specifically consider the following unit processes: double-kink formation and thermally activated motion of kinks; the close-range interactions between primary and forest dislocations, leading to the formation of jogs; the percolation motion of dislocations through a random array of forest dislocations introducing short-range obstacles of different strengths; dislocation multiplication due to breeding by double cross-slip; and dislocation pair annihilation. The model is found to capture salient features of the behavior of Ta crystals such as: the dependence of the initial yield point on temperature and strain rate; the presence of a marked stage I of easy glide, specially at low temperatures and high strain rates; the sharp onset of stage II hardening and its tendency to shift towards lower strains, and eventually disappear, as the temperature increases or the strain rate decreases; the parabolic stage II hardening at low strain rates or high temperatures; the stage II softening at high strain rates or low temperatures; the trend towards saturation at high strains; the temperature and strain-rate dependence of the saturation stress; and the orientation dependence of the hardening rate.

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