Berlin 2008 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 27: Liquid and Amorphous Metals II

MM 27.2: Talk

Wednesday, February 27, 2008, 16:00–16:15, H 0107

Phase formation and mechanical properties of Cu₅₀Zr_50−xTi_x (2.5 ≤ x ≤ 7.5) glass matrix composites — •Simon Pauly, Jayanta Das, and Jürgen Eckert — IFW Dresden

The microstructure and elastic/plastic properties of Cu₅₀Zr_50−xTi_x (2.5 ≤ x ≤ 7.5) glass matrix composites have been investigated. The presence of austenitic (Pm-3m)/martensitic phases (P21/m and Cm) with different length scales embedded in a glassy matrix enhances the plastic deformability significantly. These composites show high yield strength (up to 1753 MPa) and large plastic strain (over 15 %). The high strength scales with the volume fraction of glassy matrix and the ability of these alloys to undergo an austenite-martensite transformation is believed to be beneficial for increasing the intrinsic ductility of the BMGs.

Furthermore, the evolution of phases upon annealing ribbons of the aforementioned compositions has been studied and the crystallization kinetics has been determined using Kissinger and Johnson-Mehl-Avrami analysis. The fragility parameter of different compositions has been correlated with their plastic behavior as well as the Poisson’s ratio.