Development of Al-nanocrystals in amorphous Al rich alloys studied by positron lifetime and 2-dimensional Doppler broadening measurements
Lechner, W.; Puff, W.; Wuerschum, R.; Wilde, G.
55. Annual symposium of the Austrian Physical Society. Abstracts2005
55. Annual symposium of the Austrian Physical Society. Abstracts2005
AbstractAbstract
[en] Full text: To study the nanocrystallization process in cold rolled Al-Sm alloys, elemental foils of these elements were stacKEXd to form an array with an overall composition of Al92Sm8. This array was folded to a 10x10 mm2 multilayer sandwich with a weight of about 1 g. The folded sample was then rolled to a thickness of approx. 80 μm at a strain rate of 0.1 s-1. This folding and rolling process was repeated up to 60 times. The microstructural changes at the different stages of folding and rolling were studied by positron lifetime and 2-dim. Doppler broadening measurements. Moreover the structural changes in an Al88Y7Fe5 alloy were studied by the same techniques. Glassy ribbons with a thickness of approx. 40 μm were produced from pre-alloyed ingots of the pure elements using a single-roller melt-spinning technique in an Ar atmosphere at a wheel-speed of 45 m/s. The master ingot for the melt spinning was arc-melted in an Ar-atmosphere. To promote the development of nanocrystals the as-spun ribbons were annealed at 225 oC for 30 min and cold rolled up to a true strain of 0.3, respectively. (author)
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Vogl, G.; Sepiol, B. (Inst. fuer Materialphysik, Fakultaet fuer Physik, Universitaet Wien, Strudlhofgasse 4, 1090 Wien (Austria)) (eds.); Fakultaet fuer Physik, Universitaet Wien (Austria); Oesterreichische Physikalische Gesellschaft (Austria). Funding organisation: AVL List GmbH (Austria); Bank Austria Creditanstalt (Austria); Bundesministerium fuer Bildung, Wissenschaft und Kultur (Austria); COHERENT Deutschland GmbH (Germany); COST-European Cooperation in the Field of Scientific and Technical Research (Belgium); Cryophysics GmbH (Germany); Dr. Juergen Christian Mueller Vakuum-/Duennschicht-Technik (Germany); MaTEcK GmbH (Germany); MechOnics ag (Germany); Mikropack GmbH (Germany); Nanofilm Technologie GmbH (DE); Newport (US); Oldenburg Wissenschaftsverlag (DE); SECS GmbH (DE); Sepctra-Physics GmbH (US); VACOM Vakuum Komponenten & Messtechnik GmbH (DE); VARIAN Vacuum Technologies (US); VAT Deutschland GmbH (DE); 206 p; 2005; p. 123-124; 55. Annual symposium of the Austrian Physical Society; 55. Jahrestagung der Oesterreichischen Physikalischen Gesellschaft; Vienna (Austria); 27-29 Sep 2005; Available in abstract form only, full text entered in this record
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