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MM: Fachverband Metall- und Materialphysik

MM 47: Liquid and Amorphous Metals III

MM 47.5: Vortrag

Freitag, 27. März 2009, 11:15–11:30, IFW A

Structural Change of Zr-Ti-Cu-Ni-Al Metallic Glass with Hydrogen Absorption Treatment — •Jerome Paillier, Annett Gebert, Christine Mickel, Margitta Uhlemann, and Ludwig Schultz — Leibniz-IFW Dresden, Helmholtzstr. 20, Dresden

The use of metallic glasses for mechanical properties-based application is expected because of high yield strength and hardness. Nevertheless, a lack of ability to be strained plastically leading to brittle-fracture behaviour in both tension and compression experiments hinder their development as structural materials. Many routes are contemplated to enhance the toughness of the metallic glasses ; a possibility is to prepare a material with structural/chemical fluctuations on the nanometre scale.

Zr-Ti-Cu-Ni-Al metallic glass alloys have been studied since they exhibit a high-glass forming ability, a wide undercooled liquid region and a high thermal stability. Copper clusters formation within the amorphous matrix is expected to widen the plastic domain of the alloy. For that purpose, hydrogen has been absorbed electrochemically within the alloys. The interaction between hydrogen and the amorphous matrix is complex and dependent on the charging conditions and on the amount hydrogen absorbed. Among others, Cu-rich clusters of 10-15 nm can be formed under certain conditions. The aim is to understand/establish the relationship between the amount of hydrogen absorbed and the evolution of material characteristics. The microstructure changes have been notably characterized by XRD and TEM and also in an indirect way by the change of the thermal properties.