The formation of the orthorhombic martensite in zirconium-base alloys

N.I. Taluts; A.V. Dobromyslov

doi:doi:10.1051/jp4:20031074

Numéro		J. Phys. IV France Volume 112, October 2003


Page(s)		1099 - 1102
DOI		https://doi.org/10.1051/jp4:20031074

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

Abstract
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.