Berlin 2008 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 27: Liquid and Amorphous Metals II
MM 27.1: Vortrag
Mittwoch, 27. Februar 2008, 15:45–16:00, H 0107
Synthesis and mechanical properties of Al-Ni-La alloys prepared by hot extrusion and spark plasma sintering of gas atomized powders — •Kumar Babu Surreddi1, Hoang Viet Nguyen2, Mira Sakaliyska1, Sergio Scudino1, Mihai Stoica1, Markus Wollgarten3, Ji-Soon Kim2, and Jürgen Eckert1 — 1IFW Dresden, Institut für Komplexe Materialien, Postfach 270116, D-01171 Dresden, Germany — 2Research Center for Machine Parts and Materials Processing, University of Ulsan, Namgu Mugeo 2-Dong, San 29, Ulsan 680-749, Republic of Korea — 3Hahn-Meitner-Institut Berlin, Glienicker Straße 100, D-14109 Berlin, Germany
Bulk nanocrystalline Al87Ni8La5 specimens were prepared by in-situ devitrification and consolidation of gas atomized glassy powders. Consolidation was carried out at different temperatures by hot extrusion as well as by spark plasma sintering (SPS). Both techniques lead to highly dense bulk specimens with a microstructure consisting of an fcc-Al phase together with several intermetallic compounds. The powders consolidated by SPS display the highest compression strength, which depends on the consolidation temperature and ranges between 900 and 1000 MPa, together with plastic strains not exceeding 10 %. The extruded samples are characterized by a maximum strength of about 800 MPa but generally show larger plastic strains that can reach values of about 20 %. These results indicate that the mechanical properties of the samples can be tuned within a wide range of strength and ductility as a function of the consolidation technique and parameters used.