J. Phys. IV France 112 (2003) 1099
The formation of the orthorhombic martensite in zirconium-base alloysN.I. Taluts and A.V. Dobromyslov
Institute of Metal Physics, Ural Division of Russian Academy of Sciences, S. Kovalevskaya Str. 18, 620219 Ekaterinburg, Russia
The structure of zirconium-base alloys with metals of V-VIII groups of the Periodic Table, quenched from high temperature -phase region, was studied. X-ray diffraction analysis, light microscopy, and transmission electron microscopy were used in this investigation. It was found that the orthorhombic -phase is formed only in the Zr-Ta, Zr-Mo. and Zr-Re systems within the composition ranges from 1.5 to 2.0 at.% Mo, from 5 to 11 at.% Ta, and in the at.% Re alloy. The lattice parameters of the -phase were found and it was established that the degree of rhombicity of the -phase lattice increases with the increase of content of -stabilizing element. The morphology and crystallographic features of the -phase in these systems were studied. It is drawn the analogy between the orthorhombicity of the -phase in zirconium-base and titanium-base alloys and the tetragonality of the -phase martensite in some iron-base alloys.
© EDP Sciences 2003