Self-diffusion of manganese in Al–Pd–Mn icosahedral quasicrystals

Abstract

Abstract Self-diffusion of 54Mn in Al72Pd20Mn8 icosahedral quasicrystals has been investigated over the temperature range from 723 to 1022 K. Concentration depth profiles of the radioisotope 54Mn in the Al–Pd–Mn quasicrystals and crystals have been measured by an ion-beam sputter-sectioning technique. The temperature dependence of the self-diffusivity of Mn in Al72Pd20Mn8 icosahedral quasicrystals is expressed as The self-diffusivity of Mn in Al72Pd20Mn8 icosahedral quasicrystals is about two orders of magnitude smaller than that in Al60Pd25Mn15 crystalline alloys. The self-diffusivity of Mn in the quasicrystals is also three to four orders of magnitude lower than Mn diffusivity in crystalline Al.