Scientific aspects of the choice of the regulated structural state and texture of “marine” titanium alloys

• Published in: Metal science and heat treatment 1999-09, Vol.41 (9), p.402-407
• Main Authors: Ushkov, S. S., Kopylov, V. N., Razuvaeva, I. N.
• Format: Article
• Language: English
• Subjects: Crystallography; Deformation; Dynamic recrystallization; Lamellar structure; Low cycle fatigue; Orientation; Recrystallization; Surface layer; Texture
• ISSN: 0026-0673; 1573-8973
• DOI: 10.1007/BF02469879

1. Deformation of pseudo-α-alloy under a temperature and rate regime that provides the occurrence of the process of dynamic recrystallization of the β-phase independently of the deformation scheme, promotes the formation of a multi-component texture with disperse and uniform arrangement of the texture components having the same crystallographic orientation. The structure of the alloy consists of recrystallized β-grains with a lamellar transcrystalline structure and individual round uniformly distributed α-grains. Such a state of structure and texture provides isotropic properties in the plane of the sheet and a high resistance to LCF in a corrosive medium. 2. Deformation under temperature-and-rate regimes that do not provide processes of dynamic recrystallization of the β-phase leads either to the formation of a predominantly prismatic structure or a texture with deviated basal plane with a band pattern of texture components with the same crystallographic orientation and a band structure independently of the deformation scheme. In the presence of a prismatic texture, the mechanical properties are substantially anisotropic and the resistance to LCF in a corrosive medium diminishes in the transverse direction. 3. The test method employing a plastometer used in the present work allowed us to determine the temperature and deformation range of the formation of specific structure and texture states in pseudo-α-alloy with a sufficiently high reliability. [PUBLICATION ABSTRACT]