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MM: Fachverband Metall- und Materialphysik

MM 4: Liquid and Amorphous Metals I

MM 4.1: Vortrag

Montag, 14. März 2011, 11:00–11:15, IFW D

Effects of rhenium on glass formation and mechanical properties of metastable ZrCuAl alloys — •Steffen Schmitz, Wolfgang Löser, Hansjörg Klauß, Christine Mickel, and Bernd Büchner — IFW Dresden, P.O. Box 270116, 01171 Dresden, Germany

The effect of small additives of Re on a metallic glass forming alloy (Cu₄₆Zr₄₆Al₈)_100−xRe_x (x = 1, 2) was investigated for samples of different sizes. Re possess a positive enthalpy of mixing within the Cu-Re terminal system. Splat quenched foils of ≈ 40 µ m thickness display amorphous structure. Their crystallization temperature increases from T_x = 500 to 510 ^∘C with increasing Re fraction at nearly constant glass formation temperature T_g = 440 ^∘C. By contrast, injection cast rods consist of B2 - CuZr type metastable phase dendrites, a cubic CuZrAl type phase and randomly distributed small particles of a Re-rich phase. The presence of metastable phases leads to a unique combination of mechanical properties of as-cast rods which display high strength at sizeable plastic deformation up to є_p ≈ 4 % and an extended range of work hardening prior to failure.