Experimental investigation of the phase equilibria and thermodynamic assessment in the U-Ga and U-Al-Ga systems

JOURNAL OF NUCLEAR MATERIALS

卷:499

Article

Moussa, Chantal¹  Berche, Alexandre¹  Barbosa, Jose¹  Pasturel, Mathieu¹  Stepnik, Bertrand²  Tougait, Olivier^1,3,4 

[1] Univ Rennes 1, UMR CNRS 6226, Inst Sci Chim Rennes, Chim Solide & Mat, Campus Beaulieu, F-35042 Rennes, France

[2] AREVA CERCA, 10 Rue Juliette Recamier, F-69006 Lyon, France

[3] Univ Lille, CNRS, Cent Lille, ENSCL,Univ Artois,UMR 8181,UCCS, F-59000 Lille, France

[4] Univ Lille 1, UCCS, Batiment C3, F-59655 Villeneuve Dascq, France

关键词: U-based alloys;    Nuclear fuel;    CALPHAD;    Phase diagram;   

DOI  :  10.1016/j.jnucmat.2017.11.037

来源: Elsevier

【 摘 要 】

The phase relations in the binary U-Ga and ternary U-Al-Ga systems were established as an isopleth section and two isothermal sections at 900 K and 1150 K for the whole concentration range, respectively. They were experimentally determined by means of powder and single crystal XRD, SEM-EDS analyses on both as-cast and heat-treated samples and DTA measurements. Both systems were thermodynamically assessed using the Calphad method based on the available data, i.e. phase relations and thermodynamic properties. The new description of the U-Ga phase diagram improves the composition-temperature description for most of invariant reactions. The U-Al-Ga system is characterized by large ternary extensions of the binary phases and the absence of ternary intermediate phase at both 900 K and 1150 K. These experimental results are nicely reproduced by the Calphad assessment, allowing to extract the thermodynamic parameters further used to calculate the liquidus projection and the invariant reactions along with their temperature. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

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