Experimental investigation of Zr-rich Zr-Zr_2Ni-(Zr,Ti)_2Ni ternary eutectic system

摘要

As potential substitutes for traditional Ti(Zr)-Cu-Ni-based brazing metals for high strength Ti alloys as well as a study for metallic glass, Zr-Ti-Ni-based alloys have been attracting much attention recently. In this study, the melting temperatures and microstructures of the Zr(Ti)-rich Zr-Ti-Ni alloys with Ni content below 33.3 at.% were systematically studied. A ternary deep eutectic alloy consisting of three phases was found at the composition of Zr_(50)Ti_(26)Ni_(24) with a solidus temperature of 798 ℃ and a liquidus temperature of 809 ℃, which are significantly lower than the Zr_2Ni-(Zr,Ti)_2Ni pseudobinary eutectic melting temperature of 850 ℃. This ternary eutectic reaction can be presented as L → α-(Zr/Ti) solid solution + Zr_2Ni + ternary Laves (Zr,Ti)_2Ni.