Plastic Deformation of Mg-Zn-Y Icosahedral Quasicrystals under Confining Pressure

Deformation experiments of Mg-Zn-Y icosahedral quasicrystals under a hydrostatic confining pressure have been performed to investigate their deformation mechanism in a low temperature range. The temperature dependence of the yield stress has been successfully measured, for the first time, down to room temperature. An irregular behavior has been found in the temperature dependence: the yield stress increases rapidly with lowering temperature down to 373 K and it becomes almost constant in the temperature region lower than 373 K. The origin of such an irregular temperature dependence is discussed in terms of possible transition between two different dislocation processes: glide and climb.

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