Microstructural evolution and dynamic recrystallization mechanisms of additively manufactured TiAl alloy with heterogeneous microstructure during hot compression

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

3 Scopus Citations
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Author(s)

  • Hui TAO
  • Hui-zhong LI
  • Jia-hui LI
  • Li WANG
  • Wei-wei HE
  • Xiao-fen TAN
  • Xiao-peng LIANG

Detail(s)

Original languageEnglish
Pages (from-to)3208-3220
Journal / PublicationTransactions of Nonferrous Metals Society of China (English Edition)
Volume34
Issue number10
Publication statusPublished - Oct 2024

Link(s)

Abstract

Microstructural evolution and dynamic recrystallization (DRX) mechanisms of a Ti−48Al−2Cr−2Nb (at.%) alloy prepared by selective electron beam melting (SEBM) during hot deformation at 1150 °C and 0.1 s−1 were investigated by hot compression tests, optical microscope (OM), scanning electron microscope (SEM), electron back-scattered diffraction (EBSD) and transmission electron microscope (TEM). The results show that the initial microstructure of the as-SEBMed alloy exhibits layers of coarse γ grains and fine γ+α2+(α2/γ) lamellar mixture grains alternately along the building direction. During the early stage of hot deformation, deformation twins tend to form within the coarse grains, facilitating subsequent deformation, and a small number of DRX grains appear in the fine-grained regions. With the increase of strain, extensive DRX grains are formed through different DRX mechanisms in both coarse and fine-grained regions, involving discontinuous dynamic recrystallization mechanism (DDRX) in the fine-grained regions and a coexistence of DDRX and continuous dynamic recrystallization (CDRX) in the coarse- grained regions. © 2024 The Nonferrous Metals Society of China

Research Area(s)

  • continuous dynamic recrystallization (CDRX), discontinuous dynamic recrystallization (DDRX), heterogeneous microstructure, selective electron beam melting, TiAl alloy

Citation Format(s)

Microstructural evolution and dynamic recrystallization mechanisms of additively manufactured TiAl alloy with heterogeneous microstructure during hot compression. / TAO, Hui; LI, Hui-zhong; LI, Jia-hui et al.
In: Transactions of Nonferrous Metals Society of China (English Edition), Vol. 34, No. 10, 10.2024, p. 3208-3220.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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