Damping capacity of nanoquasicrystalline Al-Cu-Fe materials

An influence of the grain size of quasicrystalline Al-Cu-Fe materials (QCs) on their damping capacity at the alternate loading has been investigated in the strain amplitude range of 1.25x10-4 and in the temperature range 20-350 deg. C. It has been established that damping capacity of the nanometer-sized QCs at heating is essentially higher than that of submicron-sized ones. Logarithmic decrement of the QCs is found to increase progressively in whole strain amplitude range as temperatures go higher than some threshold value. Possible mechanisms of dissipation of mechanical energy in nanometer-sized QCs at elevated temperatures are discussed