Abstract
The formations of glassy and supercooled liquid phases in Ni–Nb–Zr–Ti, Ni–Nb–Zr–Ti–Pt and Ni–Nb–Zr–Ti–Pt–Cu alloys were studied by using X-ray diffraction, transmission electron microscopy, differential scanning calorimetry and isothermal calorimetry. It is found that the additions of Pt and Cu increase the supercooled liquid region of Ni–Nb–Zr–Ti alloy from 42 to 89 and 91 K, respectively. The increase in the supercooled liquid region is achieved mostly because T x rises more intensively than T g with Pt content. Quite low liquidus temperature of about 1300 K and high T g value of about 850 K obtained for the studied alloys lead to a high T g/ T l ratio which reaches 0.65 and favors the glass-forming ability. Nucleation and growth of Ni 4Ti 3 and Ni 10(Zr,Ti) 7 ss phases takes place from the supercooled liquid in Ni 60Nb 10Zr 15Ti 15 and Ni 52.5Nb 10Zr 15Ti 15Pt 7.5 alloys.
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