Internal friction in metallic materials : a handbook by M S Blanter; et al

By M S Blanter; et al

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2000a, 2000b). 8. Relaxation mechanism. After a first suggestion by Rosin and Finkelshtein (1953) of a reorientation of C–C pairs, the reorientation of interstitial– substitutional atom (IA–SA) pairs was considered (Kˆe and Tsien 1956, 1957; Tsien 1961); later a reorientation of interstitial–interstitial atom (IA–IA) pairs including the kinetics of the formation of such pairs was proposed. Verner (1965) suggested a long-range IA–IA interaction in three to five coordination shells along the 110 , 112 and 130 directions.

1970, 1971, 1975). 32 2 Anelastic Relaxation Mechanisms of Internal Friction 4. The relaxation parameters depend on solute atoms in the host lattice. %) changes the O and N relaxation parameters in Zr essentially and results in the appearance of additional peaks at higher temperatures (Mishra and Asundi 1972). The activation energy of the additional oxygen peaks in different alloys is within the range of 167–340 kJ mol−1 . 5. Relaxation mechanism. Although the single O, N, C interstitial atoms in octahedral sites of the hcp crystal lattice represent tetragonal elastic dipoles, their transition into other octahedral interstices does not change the dipole orientation and cannot cause relaxation.

This has recently been considered for the system Fe–Al–Me (with Me = Cr, Si) by Golovin (2006b), Golovin et al. (2006b), Pavlova et al. (2006). 2 Point Defect Relaxation 37 many orders of magnitude. 1 eV or even lower, with diffusion coefficients at room temperature as high as 10−5 cm2 s−1 correspondolkl and Alefeld 1978, Wipf 1997). Such ing to about 1012 jumps per second (V¨ extreme mobility and some other anomalies point to non-classical diffusion including quantum effects and tunneling (at least in bcc metals), but many details of the physics of hydrogen diffusion in different metallic structures are still not very clear.

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