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- Title
Crystallographic Features of the α-Phase Structure in Hafnium and Hafnium-Titanium Alloys.
- Authors
Khlebnikova, Yu. V.; Rodionov, D. P.; Egorova, L. Yu.; Suaridze, T. R.
- Abstract
Abstract: The structure of a hafnium crystal undergoing β → α (bcc → hcp) polymorphic transformation upon gradual cooling and the structure of Hf55Ti45 and Hf30Ti70 alloys formed under various kinetic conditions of polymorphic transformation are studied. The structure of the α phase in cast hafnium is shown to consist of lath crystals grouped into packets. The misorientations between separate laths in a packet are less than 1°. The Hf-Ti alloys in the cast state exhibit a mixed structure consisting of α-phase crystals of several morphological types. A structure of packet martensite is observed in the Hf-Ti alloys after quenching. Each packet includes laths of several crystallographic orientations. There is no regular alternation of differently orientated laths in the packet. The same set of α-phase orientations within an initial β-phase grain is observed independently of the cooling rate of the Hf-Ti alloys upon β → α polymorphic transformation. The misorientation of substructural elements within an α-phase crystal in the Hf-Ti alloys is ~5° for the cast state and ~2.2° after quenching.
- Subjects
TITANIUM alloys; POLYMORPHISM (Crystallography); CHEMICAL kinetics; CRYSTAL orientation; CRYSTAL morphology
- Publication
Technical Physics, 2018, Vol 63, Issue 12, p1771
- ISSN
1063-7842
- Publication type
Article
- DOI
10.1134/S106378421901016X