Ageing characteristics of the metastable bcc γ-phase in U-9 wt.% Mo alloy, a candidate for high uranium density nuclear fuel for research and test reactors, have been investigated in this study. ...Analyses of the aged microstructures, employing X-ray diffraction and various microscopy techniques, revealed the decomposition mechanism of the metastable γ-phase to the stable α-U and γ′ (U
2
Mo) phases. A discontinuous precipitation reaction, leading to the generation of partially transformed cellular colonies with lamellae comprising of either the α-phase or the γ′-phase in γ-phase matrix, was found to be operative. The in situ transformation of γ interlamellar regions to the γ′-phase was noticed occasionally within the γ + α lamellar colonies. Thermodynamic analysis of the U-Mo system, using free energy-composition diagrams, could associate the observed attributes of the decomposition of γ-phase to the extent of Mo segregation and the chemical driving force required for the nucleation of α- and γ′-phases in the γ-matrix.
Metallurgical interaction between U-9 wt.% Mo metallic fuel alloy and Zr-1 wt.% Nb clad material has been assessed. Interdiffusion of constituent elements across their interface, together with the ...phase reactions occurring at high temperature and during subsequent cooling, resulted in development of a layered interaction zone where coexistence of a bcc solid solution phase with varying compositions, along with α-U, α-Zr and Mo
2
Zr phases could be noticed.
Provider: - Institution: - Data provided by Europeana Collections- German war submarine awarded the Iron Cross ._x000D_
In recognition of its services to Germany during the Great War , the famous ...submarine U9 has been awarded the first Iron Cross presented since the War and allowed to retain iits name . _x000D_
U9 now carries the great Cross in a prominent position on her turret . _x000D_
Photo shows , the Iron Cross mounted on the turret of the submarine U9 ._x000D_
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