کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1645867 | 1517290 | 2013 | 4 صفحه PDF | دانلود رایگان |
The separation between partials in face-centered-cubic (FCC) alloys is known to be a function of the elastic constants and the stacking fault energy (SFE). In this work, we complete this classical picture by investigating three other effects. First we show that the applied stress component in the slip plane perpendicular to the Burgers vector induces an additional force on the partials. Depending on the value of the SFE, a critical value for this shear component leads to an infinite separation, which explains the deformation mechanism by formation of extended stacking faults. In alloys where the friction stress is not negligible, we show that the friction plays an important and complex role on dissociation, depending on the previous dislocation motion. This factor can be responsible for the discrepancy in experimental measurement of the dissociation width. In all cases, we show that the effect of the friction stress vanishes as soon as the dislocation starts gliding in its slip plane. Finally, we show that the choice of effective shear modulus in elastically anisotropic materials constitutes an important feature in the determination of the equilibrium dissociation width.
► Applied stress component in the slip plane perpendicular to the Burgers vector induces an additional force on the partials.
► In alloys where the friction stress is not negligible, friction plays an important and complex role on dissociation, depending on the previous dislocation motion.
► Effect of friction stress vanishes as soon as the dislocation starts gliding in its slip plane.
Journal: Materials Letters - Volume 97, 15 April 2013, Pages 93–96