Single crystal growth of TIMETAL LCB titanium alloy by a floating zone method

• Published in: Journal of crystal growth Vol. 405; pp. 92 - 96
• Main Authors: Šmilauerová, J., Pospíšil, J., Harcuba, P., Holý, V., Janeček, M.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01-11-2014; Elsevier
• Subjects: A1. Characterization; A2. Floating zone technique; A2. Single crystal growth; B1. Metastable β-Ti alloys; Constant-composition solid-solid phase transformations: polymorphic, massive, and order-disorder; Cross-disciplinary physics: materials science; rheology; Diffusion; Exact sciences and technology; Floating structures; Growth from melts; zone melting and refining; Interstitials; Materials science; Methods of crystal growth; physics of crystal growth; Mosaics; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Phase shift; Phase transformations; Physics; Precipitation; Single crystals; Theory and models of crystal growth; physics of crystal growth, crystal morphology and orientation; Titanium base alloys; B1. Metastable β-Ti alloys; A1. Characterization; A2. Floating zone technique; A2. Single crystal growth; Crystal growth; Differential scanning calorimetry; Reciprocal space; Phase transformations; Metastable states; Digital simulation; Reciprocal lattice; Floating zone; Precursor; Alloying elements; Titanium alloys; Monocrystals; Precipitation; Growth mechanism; Chemical composition; Diffusion; Mosaic structure; Crystal growth from melts; Crystal structure
• ISSN: 0022-0248; 1873-5002
• DOI: 10.1016/j.jcrysgro.2014.07.050

The methodology of single crystal growth of metastable β-Ti alloy TIMETAL LCB in an optical floating zone furnace is presented in this paper. Chemical compositions of both precursor material and single crystals were checked. It was found that the concentration of base alloying elements did not change significantly during the growth process, while the concentrations of interstitial elements O and N increased. DSC measurement determined that this concentration shift has a slight impact on ongoing phase transformations, as in the single-crystalline material peak associated with α phase precipitation moves by a few degrees to a lower temperature and peak attributed to diffusion controlled growth of ω particles shifts to a higher temperature. X-ray reciprocal space maps were measured and their simulation showed that the single crystal has a mosaic structure with mean size of mosaic blocks of approximately 60nm.
•Single crystals of metastable β-Ti alloy TIMETAL LCB were grown by an optical floating zone method.•Chemical compositions of precursor and single crystal are compared.•The influence of compositional change on phase transformations is studied by DSC.•Mosaic structure of single crystal is studied by a reciprocal space mapping method.