Abstract
The phase equilibrium of the Ti-Ta-Sn ternary system at 1173 K was investigated experimentally using x-ray diffraction, scanning electron microscopy, and electron probe microanalysis. The isothermal section on the whole composition range was constructed, where eight single-phase regions and seven three-phase regions coexisted. The ternary compound Ti36Ta28Sn36 was found in the experiment, and two three-phase regions β-Ti6Sn5 + Ti36Ta28Sn36 + Ta3Sn and Ti2Sn + Ti3Sn + β(Ti, Ta) were experimentally detected. Experimental analysis shows that the solid solution β(Ti, Ta) dissolves up to approximately 21.2 at.% Sn, and that the maximum solubility of Ta in Ti3Sn and Ti5Sn3 can reach up to 9.3 and 5.9 at.%, respectively. The solubility values of Ta in Ti2Sn and β-Ti6Sn5 are no less than 7.3 and 15.5 at.%, respectively, whereas that of Ti in Ta3Sn is no less than 8.8 at.%. The liquid phase mainly exists in the Sn-rich corner.
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The authors would like to thank for the financial support from the Major State Basic Development Program of China (973 Program) (No. 2014CB644000), National Natural Science Foundation of China (Grant No. 51371200) and Hunan Provincial Natural Science Foundation of China (No. 14JJ3124).
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Wang, J.L., Liu, L.B., Zhang, X.D. et al. Isothermal Section of the Ti-Ta-Sn Ternary System at 1173 K. J. Phase Equilib. Diffus. 35, 262–268 (2014). https://doi.org/10.1007/s11669-014-0304-z
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DOI: https://doi.org/10.1007/s11669-014-0304-z