A REVIEW OF PLASTIC PROPERTIES OF QUASICRYSTALS

摘要

Plastic properties of quasicrystals elucidated by indentation experiments and high temperature compression experiments, have been reviewed. Hardness value Hv at room temperature satisfies Hv/E=0.05 (E: Young's modulus) and the value decreases gradually with increasing temperature up to 600-700K but then rapidly above the temperature, suggesting a change of the deformation mechanism. Quasicrysials are commonly plastically compressible above (0.7-0.8)T_m (T_m: the melting point) with the yield stress decreasing rapidly with increasing temperature. The most characteristic feature of the high temperature plasticity is the pronounced work softening up to high strain. The mechanism of the high temperature deformation is discussed based on the dislocation climb the velocity of which is governed by the jog-pair formation process.