The results are described of some studies of a mechanism of energy dissipation due to strain-induced reorientation of tetragonality in binary manganese-copper alloys containing 60–90 wt.-% Mn. The dependence of the structure upon the progress of ageing and the temperature of observation is reported. A high damping capacity is associated with the presence of a tetragonal structure, and the damping capacity varies approximately as (strain)n, where n lies between 0.15 and 0.44. The reorientation of tetragonal domains has been investigated by X-ray techniques, and, the corresponding movement of domain boundaries has been observed and recorded by optical microscopy.
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