Plasticity of single-grain icosahedral Al–Pd–Mn quasi-crystals deformed at room temperature Original Research Article

Transmission electron microscopy observations have been performed on icosahedral Al–Pd–Mn quasi-crystal samples deformed at 20 °C under a high confining pressure. They reveal a large density of wavy walls from which several climbing dislocations are emitted. Near-screw dislocations have been found at the wall terminations with a Burgers vector contained in the wall plane. Careful plane determinations and dislocation analyses are not consistent with a glide and cross-slip mechanism. The results can be better interpreted as a deformation by cracks in mode III followed by a re-healing process.