期刊
CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY
卷 67, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.calphad.2019.101686
关键词
Ti-Zr-Sn; Phase equilibria; CALPHAD; Thermodynamics; Solidification
类别
资金
- National Natural Science Foundation of China [51701094, 51801101, 51571113]
- Natural Science Foundation of Jiangsu Province, China [BK20171014]
- National Defense Basic Scientific Research Program of China [JCKY2018414C020]
- China Postdoctoral Science Foundation [2019M651812]
The development of CALPHAD-type thermodynamic database for Ti or Zr based biomedical alloys has been spurred by the increased interest in efficiently tailoring an alloy composition to obtain high stability of beta_bcc, low Young's modulus, and free of detrimental phases. However, the thermodynamic prediction is not adequate to be performed without the information of key sub-ternary Ti-Zr-Sn system. In present work, the thermodynamic assessment of Ti-Zr-Sn system is performed via a critical evaluation of phase equilibria and microstructure development in this ternary system. The partial isothermal sections at 1323 K and 1473 K with Sn content below 40 at. % are obtained by analyzing chemical compositions and crystal structures of individual phases in the annealed alloys. The composition homogeneity range of most phases is validated to favor a ternary extension paralleling to the Ti-Zr axis. Particularly, beta_bcc and eta phases (with the chemical composition (Ti, Zr)(5)Sn3+x) show complete solubility of Ti and Zr from Ti-Sn edge to Zr-Sn edge. With the database, negligible ternary solubility of Zr4Sn phase, microstructure development in the as-cast samples, and the controversial conclusions in literature are discussed. Most of the experimental findings, including equilibrium phase constitution, solidification sequence, DSC signals, projections of liquidus, are reproduced in a self-consistent way. The work moves towards the completeness of multi-component Ti/Zr thermodynamic database. It can be used for composition design of novel metastable beta-type biomedical alloys.
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