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Microstructure and Texture Evolution in an Intermetallic β‐Stabilized Ti A l Alloy During Forging and Subsequent Isothermal Annealing
Author(s) -
Gaitzenauer Andrea,
Stark Andreas,
Gosslar Daniel,
Clemens Helmut,
Mayer Svea
Publication year - 2014
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201300265
Subject(s) - microstructure , materials science , intermetallic , annealing (glass) , alloy , isothermal process , lamellar structure , forging , metallurgy , composite material , thermodynamics , physics
Microstructure and texture formation were investigated in an intermetallic Ti–43.4Al–4.2Nb–1.1Mo–0.1B (in at.%) alloy after near conventional forging in the (α + β) phase field region and subsequent isothermal annealing treatments at 1150 °C for different holding times. During forging and the following cooling process a fine grained microstructure is formed consisting of lamellar α 2 /γ colonies and elongated grains of the β o phase situated at the colony boundaries. The isothermal annealing treatment leads to a significant change of the forged microstructure. After hot‐forging, all phases show typical fiber textures as it is expected for uniaxial deformation. In the as‐forged state the α 2 (α) phase exhibits a 〈11‐20〉 fiber, the β o (β) phase has a strong and sharp ⟨ 001 ⟩ fiber and the γ phase shows a ⟨ 110 ⟩ and a weaker ⟨ 101 ⟩ fiber. After additional annealing at 1150 °C for 8 h, the textures are almost unchanged in contrast to the microstructure.