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It is shown that high temperature damping spectra in pure metals can be analysed in true relaxation peaks, located between 0.4 and 0.7 Tm, and large non linear effects giving internal friction maxima in the same temperature range. A number of experiments relating with single crystals indicate that damping originates mainly from lattice dislocation motions and not, as previously assumed, from grain boundary sliding. It is also shown that anelasticity seems to be due to long range interactions between dislocations or between dislocations and boundaries or sub-boundaries rather than to the influence of the line tension of the bowing out segments

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