J. Mater. Sci. Technol. ›› 2014, Vol. 30 ›› Issue (6): 584-589.DOI: 10.1016/j.jmst.2014.05.006

• Research-article • Previous Articles     Next Articles

Microstructural Evolution and Mechanical Behaviour of Metastable Cu–Zr–Co Alloys

Pauly S.1, *, Kosiba K.1, Gargarella P.1, Escher B.1, Song K.K.1, Wang G.2, Kühn U.1, Eckert J.1, 3   

  1. 1. IFW Dresden, Institut für Komplexe Materialien, Helmholtzstra?e 20, D-01069 Dresden, Germany;
    2. Laboratory for Microstructures, Shanghai University, Shanghai 200444, China;
    3. TU Dresden, Institut für Werkstoffwissenschaft, D-01062 Dresden, Germany
  • Received:2014-02-03 Online:2014-06-20 Published:2014-07-31
  • Contact: Corresponding author. Ph.D.; Tel.: +49 351 4659 451

Abstract: Three different Cu–Zr–Co alloys, namely Cu40Zr37.5Co22.5, Cu42.5Zr45Co12.5 and Cu49Zr49Co2, were obtained by rapid cooling. The microstructure and phase formation of as-cast rods with diameters of 2 mm are compared with those of the respective ingots. An increasing Co content stabilises the B2 CuZr phase and leads to the precipitation of a ternary Cu–Zr–Co phase. The variation of the cooling rate affects the size of the B2 dendrites as well as the volume fraction and the morphology of the interdendritic phases. The mechanical properties were determined in compression and all alloys show a certain plastic deformability despite the presence of several binary and ternary intermetallic phases. The deformation mechanisms are discussed on the basis of the microstructures and the constituent phases.

Key words: Bulk metallic glasses, Microstructural evolution, Mechanical behaviour