β Scribed by G.S. Baker
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and Lticke is modified for metals with high stacking fault energy. It is assumed that the most abundant impurity atom species interacts only with the edge component of each dislocation. For this model the hysteretic, or frequency independent, damping initially increases linearly with stress amplitude and approaches the Granato-Liicke amplitude dependence at higher stresses. The influence of a second, fess abundant, impurity atom species which can interact with both screw and edge components also is considered. When the glide distance of a dislocation after breakaway becomes comparable with the mean spacing of the second type of impurity, the hysteretic damping becomes amplitude independent. This modification is best suited for application to the damping of b.c.c. metals containing a higher concentration of substitutional impurities than interstitial impurities.
π SIMILAR VOLUMES
The internal friction of Mg was studied at 4 kc/s and 40 kc/s as a function of temperature (4.2-3OO"K), plastic deformation, crystalline orientation, heat treatment and impurity content. In pre-strained polycrystalline samples a peak was observed at 20Β°K which annealed out readily at 300"K, and a v
The influences of NaCl, LiF and other additions on the Al electrolyte are reviewed . LiF is the most favourable addition and gives a slight increase in the current efficiency of the Al reduction process . R&=6-L'influence de NaCl, LiF et d'auters additions sur les propri6t6s physicochimiques du bai