By M S Blanter; et al
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Extra info for Internal friction in metallic materials : a handbook
1. Octahedral interstices in the bcc crystal lattice: large circles are metal atoms; small circles, squares and triangles are interstices of the sublattices p = 1, 2 and 3, respectively diﬀuse from sublattices “2” and “3” into “1”, and n1 will be higher than n2 and n3 . When the stress sign changes the reverse process sets in, and under the action of alternating periodic stresses this “diﬀusion under stress” of IA causes periodic variations of the occupation numbers n1 to n3 . 2); a0 is the lattice parameter of the pure metal.
11. %Al alloy: (a) overview of Zener peaks measured at diﬀerent temperatures between 668 and 882 K; inset in left-upper corner: isothermal tests at 738 K: IF and relative modulus supplied with exponential background, and IF peak after background subtraction; (b) Arrhenius plot. (From Golovin and Rivi`ere 2006a) changes in the atomic order of H atoms in their tetrahedral sites to occur, and good agreement with diﬀusion measurements by NMR and neutron spectrometry has been found. For systems which are prone to develop precipitates, or to dissolve them at more elevated temperatures, the Zener relaxation eﬀect may be applied to monitor the not yet precipitated or already dissolved solute content in studies of precipitation kinetics (for examples, see Schaller 2001b, and Sect.
This explains why Qm −1 in technically pure metals is higher than that in the high purity metals. The pair reorientation or the change in short-range order takes place via diﬀusional jumps of the more mobile atoms. There are two types of such jumps: in the basic plane (with the jump frequency ω1 ) and along the hexagonal axis (ω2 ). In the case of IA–SA relaxation in Zr–O (Ritchie et al. 1976, 1977), the relaxation is controlled by ω1 . Further progress in understanding the relaxation mechanism needs more experimental study of single crystals of well-deﬁned chemical composition, and the analysis of results should be based on modeling the short-range order of interstitial atoms and its changes under stress taking into account the long-range interactions of dissolved atoms.
Internal friction in metallic materials : a handbook by M S Blanter; et al