This paper investigates the effects of Ni addition on the glass forming ability (GFA) and mechanical properties in Cu 60Àx Ni x Zr 22 Ti 18 (x ¼ 0$15) metallic glass alloys. Partial substitution of Cu by Ni in the alloys improved the GFA. By increasing Ni content x from 0 to 6, the supercooled liquid region (ÁT x ) and crystallization temperature (T x ) were increased, whereas the liquidus temperature decreased to reach the lowest value at x ¼ 6. The lowering of liquidus temperature improved the GFA, and the maximum GFA of 6 mm in diameter was obtained at x ¼ 6. The compressive strength and micro hardness of the alloys were raised by increasing Ni content, and the Ni containing alloy showed some macroscopic plasticity after yielding.

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This article reports on low (below 800 C) melting temperature characteristics of a Zr-TiNi-Cu alloy system, designed by adding a small amount of Cu to a Zr-Ti-Ni eutectic alloy system in the Zr-rich corner of the Zr-Ti-Ni system. A series of Zr-Ti-Ni-Cu-based alloy buttons of varying Cu content was fabricated by an arc melting machine. The melting temperature ranges of the quaternary alloys were systematically examined by differential thermal analysis (DTA). As a result, a quaternary eutectic alloy of composition Zr 54 Ti 22 Ni 16 Cu 8 with a low melting temperature range from 774 C to 783 C was found. In addition, structural and chemical analysis results for the slowly solidified, quaternary eutectic alloy sample revealed equivalent quaternary eutectic structure and phases to those of the ternary eutectic Zr 50 Ti 26 Ni 24 alloy, except for a small amount of Cu dissolved in individual constituent phases. The wetting angle tested at 800 C for 60 s on the commercially pure titanium was about 25 .