J. Phys. IV France
Volume 112, October 2003
Page(s) 1099 - 1102

J. Phys. IV France
112 (2003) 1099
DOI: 10.1051/jp4:20031074

The formation of the orthorhombic martensite in zirconium-base alloys

N.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 $\beta$-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 $\alpha''$-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 $\rm Zr-1.5$ at.% Re alloy. The lattice parameters of the $\alpha''$-phase were found and it was established that the degree of rhombicity of the $\alpha''$-phase lattice increases with the increase of content of $\beta$-stabilizing element. The morphology and crystallographic features of the $\alpha''$-phase in these systems were studied. It is drawn the analogy between the orthorhombicity of the $\alpha''$-phase in zirconium-base and titanium-base alloys and the tetragonality of the $\alpha$-phase martensite in some iron-base alloys.

© EDP Sciences 2003