Al-Pd-Mn icosahedral quasicrystal: deformation mechanisms in the brittle domain.

Michael Texier (1) , Anne Joulain (2) , Joel Bonneville (2) , Ludovic Thilly (2) , Jacques Rabier (2)

1 Faculty of Sciences
2 LMP - Laboratoire de métallurgie physique

The extreme brittleness of Al-Pd-Mn quasi-crystalline alloys over a wide range of temperatures drastically restricts the investigation of their plastic deformation mechanisms over a small high-temperature regime. Recently, plastic deformation of Al-Pd-Mn quasicrystal has been achieved in the brittle domain (20°C ≤ T ≤ 690°C) using specific deformation devices, which combined an uniaxial compression deformation or a shear deformation with an hydrostatic pressure confinement (0.35 GPa – 5 GPa). Results obtained with these experimental techniques, which provide various deformation conditions giving rise to a range of Al-Pd-Mn plastic features in the brittle domain, are discussed. On this basis, we propose that low and intermediate temperature plastic properties of Al-Pd-Mn are controlled by non-planar dislocation core extensions that are specific to the non-periodic structure.

Mots clés: Physical Sciences

Michael Texier, Anne Joulain, Joel Bonneville, Ludovic Thilly, Jacques Rabier. Al-Pd-Mn icosahedral quasicrystal: deformation mechanisms in the brittle domain.. Philosophical Magazine, 2007, 87 (10), pp.1497-1511. ⟨10.1080/14786430601047707⟩. ⟨hal-00513797⟩