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Microstructural Refinement of a Ti‐40Al‐8Nb‐0.5B Alloy by Hot Deformation Within (α+β) Phase Field and Subsequent Tempering
Author(s) -
Tian Pujian,
Yang Guang,
Ge Zhenghao,
Wang Yifei,
Cheng Liang,
Liu Yanhui,
Kou Hongchao
Publication year - 2019
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.201900239
Subject(s) - materials science , lamellar structure , tempering , microstructure , nucleation , alloy , deformation (meteorology) , phase (matter) , metallurgy , recrystallization (geology) , dynamic recrystallization , composite material , hot working , thermodynamics , paleontology , chemistry , physics , organic chemistry , biology
In this work, a refined microstructure is obtained in a Ti‐40Al‐8Nb‐0.5B alloy (at%) by hot deformation in the (α + β) phase region and subsequent tempering at 800 °C. The results show that the dynamic recrystallization of α phase occurred during the hot deformation, which resulted in the grain refinement from 56 to 18 µm. Meanwhile, high‐density stacking faults are introduced into the deformed α phase. After tempering at 800 °C for 5 h, ultra‐thin γ lamellar precipitated from the ordered α 2 phase by following the Blackburn orientation relationships. The average lamellar spacing is about 10 nm. The refinement of lamellar spacing is mainly attributed to the numerous nucleation sites of γ phase caused by the hot deformation. In addition, fine γ and ω 0 particles formed in the retained B2 phase, leading to the formation of a refined near‐lamellar microstructure.