Phase diagram investigations of the Ni–Sn–Bi system

• Published in: Journal of alloys and compounds Vol. 469; no. 1; pp. 264 - 269
• Main Authors: Vassilev, G.P., Lilova, K.I., Gachon, J.-C.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 05.02.2009; Elsevier
• Subjects: Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Materials science; Metals and alloys; Phase diagrams; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Phase diagrams of metals and alloys; Physics; Powder metallurgy; Powder metallurgy; Metals and alloys; Phase diagrams; Scanning electron microscopy; Annealing; Approximate method; Ternary systems; Differential thermal analysis; XRD; Quenching; Isothermal section; Bismuth; Phase equilibria; Tin; Chemical composition; Nickel
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2008.01.100

Phase equilibria were studied in the system Ni–Sn–Bi at 733 and 903 K. For this purpose, 30 ternary samples were synthesized using intimately mixed powders. After annealing in quartz ampoules and quenching, all alloys were analysed by scanning electron microscope. Differential thermal analyses (DTA) were done with specimens having chemical compositions near to the expected ternary Bi–Sn eutectic point. Isothermal sections of ternary system at 733 and 903 K were constructed. The phase equilibria between the liquid and the solid phases ((Ni), NiBi, Ni 3Sn 2 and Ni 3Sn 4) appeared to be inclined towards the Bi-corner at all temperatures. A formerly unknown ternary compound with approximate formula Ni 7Sn 2Bi and chemical composition (in mole fractions) X Ni = 0.66 ± 0.03, X Sn = 0.21 ± 0.02 and X Bi = 0.13 ± 0.02 was observed by scanning electron microscopy but it could not be identified by X-ray diffraction analyses.