β Scribed by S.M. Copley; B.H. Kear
No coin nor oath required. For personal study only.
The motion of glide dislocations in f.c.e. alloy crystals subjected to a nnixiaf stress is analyzed assuming that the steady-state velocity of each Shockleg partial is a ftmction of the t,otal force acting on it per unit length. It is shown that bhe velocity of an i (I IO) glide dislocation is a function of the average B&mid factor of ita Shockley partials. It follows that the usual interpret&ion of Schmid's Law where yield stress is correlat~ed with the t,otal Burgers vector of the glide disloaat,ion is valid only when the magnitndes of the Burgers vectors of the partial dislocations are equal, as happens t.o be the case in the f.c.c. lattice. It, is also shown that the degree of dissociation of a glide dislocation depends on its v&&y
π SIMILAR VOLUMES
## By means of an electron microscope, the width of dislocation ribbons in a stress-annealed pyrolytic graphite and doped with iodine chloride (ICl) and bromine was investigated as a function of temperature in the range 100Β°K to 300Β°K. The impurity content amounted to 1.1 at % for ICI and 1.6 at %