Sn-Zr Binary Phase Diagram Evaluation

Bajenova, I.; Phiri, A.; Kareva, M.; Kuznetsov, V.

Авторы: Bajenova I., Phiri A., Kareva M., Kuznetsov V.
Сборник: MSI Eureka, Effenberg, G. (Ed.)
Серия: Binary Evaluations
Глава в коллективной монографии
Год издания: 2017
Место издания: MSI, Materials Science International Stuttgart Stuttgart, Germany
Первая страница: 1
Последняя страница: 16
Аннотация: The binary Sn-Zr system is important for development of Zr based cladding materials for nuclear industry [2010Abo, 2010Coi, 2010Cor, 2008Gro, 2010Kum, 2010Mcr], brazing materials [2002Stu, 2003Stu] and medical materials [2014Zho]. Extensive experimental investigation of the whole system was made by [1951Phe, 1952Phe, 1953Mcp]. The solubility of Sn in Zr was refined by [1983Ari]. The liquidus temperatures in the region from 55 to 98 at.% Sn were measured by [2008Mud], using non-standard technique of appearance of solid phases’ lines in high-temperature X-ray diffraction patterns during cooling of the sample. Temperature of peritectoid formation of the Zr4Sn compound was established by [2008Per] using samples with low oxygen content. Reviews of experimental results on phase equilibria were published by [1976Kub, 1979Nor, 1983Abr, 1985Mas, 2010Oka]. Review on some thermodynamic data was made by [2001Yas]. Properties and structural characteristics of the phases were reviewed by [2012Lem]. Experimental data on the phase equilibria and crystal structures of the phases at around 37 to 44 at.% of Sn were extremely contradictive (see discussions in [1983Abr] and [1990Kwo]). The situation was clarified by experimental investigations [1990Kwo, 1992Kwo, 2008Per], coupled with detailed DFT calculation [2006Bay]. Zr5Sn3 and Zr5Sn4 exist as separate phases at low temperatures, but merge into the single phase η (Zr5Sn3+x) at higher temperatures. The calculation [2006Bay] also confirmed the shift of the composition of A15 phase from ideal to actual Zr4Sn one. Enthalpies of formation of liquid phase were measured by [1990Sud, 1992Val] using high temperature isoperibolic calorimetry at about 1600°C. The integral mixing enthalpies obtained in both works are in good agreement, though partial ones exhibit different behavior. [2000Bou] measured limiting enthalpies of dissolution of solid Zr in liquid tin at 900°C and calculated limiting partial enthalpies of Zr, referred to liquid Zr. Both are claimed to be positive, which contradicts to experimental data [1990Sud, 1992Val], as well as to Miedema calculations [1976Mie, 2005Vas]. For solid phases only the formation enthalpy of Zr5Sn3 was determined by [1998Mes, 2001Mes]. Early CALPHAD calculations of the system [1997Kor, 1998Sub, 1999Dup, 2001Kay] were either based solely on the phase equilibria or used estimated thermodynamic data. [2006Per, 2008Per] performed new assessment of the system. The results of DFT calculations [2006Bay] of the formation enthalpies for solid phases were rescaled to experimental data [1998Mes] for the Zr5Sn3 phase and accepted as formation enthalpies of the compounds. Model of the Zr5Sn3+x phase was based on structural data of [1990Kwo] and their own X-ray data. The calculated phase equilibria [2008Per] are in good agreement with the experiment. [2017Ber] performed new DFT calculation of enthalpies of formation for all the phases, their results proved to be nearly identical to [2006Bay]. [2017Ber] performed also new CALPHAD calculation, using DFT data without rescaling. The values of enthalpies of both solid and liquid phases, as obtained by [2017Ber], are crudely equal to 4/5 of those of [2008Per]. This is close to inverse scaling factor, as obtained by [2008Per]. There have been a few studies devoted to mechanical, thermal and corrosion properties of Zircaloy-2 and Zircaloy-4 [1958Iva, 2003Stu, 2006Ahm, 2007Ple, 2008Gro, 2011Sai].
Добавил в систему: Карева Мария Александровна

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Sn-Zr Binary Phase Diagram Evaluationстатья

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