Internal friction in indium single crystals

Low frequency, internal friction measurements made as a function of temperature on pure indium in single crystal form have shown three effects which could be resolved into the following three separate mechanisms: (i) A frequency insensitive peak in internal friction observed at about 170 K is believed to be associated with the motion of twin boundaries; (ii) A relaxation measured at about 273 K is interpreted as originating from the motion of dislocations interacting with vacancies; (iii) A background relaxation between 320 K and the melting point is attributed to dislocation climb.