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MM: Metall- und Materialphysik

MM 13: Symposium Modern Metallic Materials Design III

MM 13.1: Vortrag

Dienstag, 28. März 2006, 10:15–10:30, IFW B

Formation and properties of Ce-based Metallic Plastics — •Bo Zhang and Wei Hua Wang — Institute of Physics, Chinese Academy of Sciences, Beijing 100080, P. R. China

We report the formation and unique properties of the polymerlike Ce-based bulk metallic glasses. Ternary Ce-Al-Cu(Co,Ni) glassy rods of 1-3 mm in diameter can be easily formed in a wide composition range by a conventional copper-mold cast method. Substituting Ce with low cost Ce-rich misch metal (MM), MM-Al-Cu bulk glasses have the similar glass forming ability (GFA) as that of Ce-Al-Cu. With minor addition of extra elements like Fe, Co, Ni, Nb, Zn and Si, the critical diameter of full glassy rods of the matrix Ce-Al-Cu can be remarkably enhanced from 2 mm to at least 3-10 mm. It is found that the often-cited empirical criteria for bulk metallic glass formation cannot interpret the formation and addition effect on GFA in the metallic glasses. The striking effect and mechanism of the microalloying on the GFA of the metallic glasses are studied. These materials with extremely low glass transition temperature Tg (341 K - 439 K, even below the boiling temperature of water) and excellent deformability at low temperatures, which can be regarded as metallic plastics, should have potential applications.