Determination of α lamellae orientation in a β‐Ti alloy using electron backscatter diffraction

• Published in: Journal of applied crystallography Vol. 57; no. 4; pp. 1001 - 1010
• Main Authors: Harcuba, Petr, Šmilauerová, Jana, Janeček, Miloš, Ilavský, Jan, Holý, Václav
• Format: Journal Article
• Language: English
• Published: 5 Abbey Square, Chester, Cheshire CH1 2HU, England International Union of Crystallography 01.08.2024; Blackwell Publishing Ltd; International Union of Crystallography (IUCr)
• Subjects: Coordinates; Cubic lattice; Electron backscatter diffraction; Electrons; habit planes; Iron; Lamellae; Lattice parameters; metastable titanium alloys; Orientation; orientation relationships; Research Papers; Scanning electron microscopy; Titanium base alloys; α phase; α phase; habit planes; metastable titanium alloys; orientation relationships
• ISSN: 1600-5767; 0021-8898; 1600-5767
• DOI: 10.1107/S160057672400400X

The spatial orientation of α lamellae in a metastable β‐Ti matrix of Timetal LCB (Ti–6.8 Mo–4.5 Fe–1.5 Al in wt%) was examined and the orientation of the hexagonal close‐packed α lattice in the α lamella was determined. For this purpose, a combination of methods of small‐angle X‐ray scattering, scanning electron microscopy and electron backscatter diffraction was used. The habit planes of α laths are close to {111}β, which corresponds to (1320)α in the hexagonal coordinate system of the α phase. The longest α lamella direction lies approximately along one of the ⟨110⟩β directions which are parallel to the specific habit plane. Taking into account the average lattice parameters of the β and α phases in aged conditions in Timetal LCB, it was possible to index all main axes and faces of an α lath not only in the cubic coordinate system of the parent β phase but also in the hexagonal system of the α phase. A combination of electron backscatter diffraction and small‐angle X‐ray scattering analyses was employed to index all main axes and faces of an α lath not only in the cubic coordinate system of the parent β phase but also in the hexagonal system of the α phase.