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Evolution of microstructure in niobium rich (α 2 +γ) based titanium aluminide alloy during hot compression
Bhavanish Kumar Singh,
Published in Elsevier Ltd
2019
Volume: 754
   
Pages: 708 - 718
Abstract
A β-solidified nearly lamellar γ-TiAl (α 2 +γ) based alloy was investigated to understand the evolution of microstructure during hot isothermal compression test at 1050 °C (below eutectoid). Cylindrical samples were compressed to different true strains up to 60%. The deformed samples were then characterized using scanning electron microscopy (SEM), electron backscattered diffraction (EBSD) and transmission electron microscopy (TEM) to understand the active deformation mechanisms. Dynamic flow softening behavior, i.e., dynamic recrystallization (DRX) type flow was observed. While no new strain induced phases were observed, there were minor changes in the phase fractions as a function of strain. Kinking and bending of lamellae at certain areas in the microstructure of compressed samples were predominant. Preliminary analysis by TEM indicated the presence of twinning in both γ and β phases. © 2019 Elsevier B.V.
About the journal
JournalData powered by TypesetMaterials Science and Engineering A
PublisherData powered by TypesetElsevier Ltd
Open AccessNo
Concepts (17)
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    Compression testing
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    Dynamic recrystallization
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    High resolution transmission electron microscopy
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    Microstructural evolution
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    Niobium
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    Scanning electron microscopy
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    Strain
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    Twinning
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    Active deformation
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    CYLINDRICAL SAMPLES
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    Deformed samples
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    Dynamic recrystallization (drx)
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    Electron back-scattered diffraction
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    HOT ISOTHERMAL COMPRESSIONS
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    Preliminary analysis
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    TITANIUM ALUMINIDE ALLOY
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    Titanium alloys