Dresden 2006 – scientific programme

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MM: Metall- und Materialphysik

MM 24: Quasicrystals

MM 24.1: Talk

Wednesday, March 29, 2006, 14:00–14:15, IFW D

Formation of quasicrystals and complex periodic intermetallics in the Al-Pd-Ru and Al-Pd-Rh alloy systems — •Benjamin Grushko¹, Dmytro Pavlyuchkov^1,2, and Bartosz Przepiórzyński^1,3 — ¹Institut für Festkörperforschung, Forschungszentrum Jülich, D-52425 Jülich, Germany — ²I.N. Frantsevich Institute for Problems of Materials Science, 03680 Kiev 142, Ukraine — ³Institute of Materials Science, Silesian University, 12 Bankowa, 40007 Katowice, Poland

This work continues the study of formation of complex intermetallics, including quasicrystals, in ternary Al-Pd-TM systems. The Al-Pd-Ru system is related to extensively studied Al-Pd-Fe [1, and Al-Pd-Rh to Al-Pd-Co [2]. We confirmed the thermal stability of the icosahedral (I) phase. The ternary extension of the Al-Pd Epsilon-phases is comparable to that in Al-Pd-Co. Three ternary cubic phases isostructural to C, C1 and C2 in Al-Pd-Fe were revealed. No stable quasicrystals were revealed in Al-Pd-Rh. The Al-Pd and Al-Rh Epsilon-phases form a continuous range. Also C-Al5Rh2 exhibited significant solubility of Pd. Two ternary phases structurally related to C-Al5Rh2 phase were revealed: cubic C2, isostructural to that in Al-Pd-TM (TM=Fe,Co,Ru) and hexagonal C3. The latter has a wide compositional range along about constant Al. [1] S. Balanetskyy, B. Grushko, T.Ya. Velikanova and K. Urban, J. Alloys Comp. 376, 158 (2004). [2] M. Yurechko, B. Grushko, T. Velikanova and K. Urban, J. Alloys Comp. 337, 172 (2002).