Abstract
Isothermal section of Ti-Nb-Sn at 1173 K was experimentally studied by back-scattered electron, electron probe microanalysis and X-ray diffraction analysis. Solid solution phase β(Ti, Nb), liquid Sn and eight intermetallic compounds Ti3Sn, Ti2Sn, Ti5Sn3, Ti6Sn5, Nb6Sn5, Nb3Sn, Ti3Nb2Sn2 and Ti3NbSn coexisted. Four ternary phase regions Ti3Sn + Ti3NbSn + β(Ti, Nb), Ti3NbSn + Ti3Nb3Sn2 + Ti3Sn, Ti2Sn + Ti3Sn + Ti3Nb3Sn2 and Ti6Sn5 + Ti3Nb3Sn2 + Nb3Sn were experimented. In addition, the proper composition range of the single phase was suggested. All the detected Ti-Sn and Nb-Sn compounds have a remarkable solubility along the isoconcentration of Sn. β(Ti, Nb) has a relatively large solution while liquid Sn has a little in the isothermal section.
Highlights
Titanium alloys have characteristics of high strength, super-elasticity and good biocompatibility.They are promising materials in many fields especially in a biomedical aspect
The knowledge of the phase diagram is of great importance in the design and development of titanium alloys
Binary phase regions and four ternary phase equilibrated alloy method
Summary
Titanium alloys have characteristics of high strength, super-elasticity and good biocompatibility. They are promising materials in many fields especially in a biomedical aspect. Nb and Sn are alloy elements of biocompatibility, and do not increase the martensitic transformation temperature of metastable β titanium alloys [1,2,3,4,5,6]. It is necessary to know the phase equilibrium in Ti-Nb-Sn ternary system. The knowledge of the phase diagram is of great importance in the design and development of titanium alloys. The information of Ti-Sn, Nb-Sn and Ti-Nb binary systems can be found in recent studies
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