Formation and investigation of the structure and mechanical properties of bulk metallic glassy composite (Ti–Zr)–(Cu–Ni–Co) alloys

(Ti–Zr)–(Cu–Ni–Co) bulk metallic alloys were investigated in the present work. Taking compositional formula (Ti–Zr)49.5+x(Cu–Ni)49.5–xCo1 as a basis, we increased the content of Ti and Zr elements and decreased the content of Cu and Ni with the purpose of production of crystal-glassy composites. Such a kind of approach may allow combination of high strength of glassy alloys and good plasticity of crystalline alloys in these composite materials. According to this approach a large number of the alloys of different composition were prepared and investigated. Ti43.2Zr7.8Cu40.8Ni7.2Co1 bulk glassy-crystal composite sample showed the compressive strength of 1800 MPa and plasticity of about 5%. The effect of Y addition on the glass-forming ability and mechanical properties of the studied alloys was also investigated.

► Addition of Y negatively affects the glass-forming ability of investigated alloys.
► Composite samples were obtained for the alloys series: (Ti–Zr)49.5+x(Cu–Ni)49.5–xCo1.
► Composite material consists of amorphous matrix reinforced by β-Ti phase.
► Ti43.2Zr7.8Cu40.8Ni7.2Co1 alloy has an optimum properties and 3 mm in diameter.
► Annealing samples from this alloy leads to slight hardening, but to loss plasticity.