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Phase Precipitation Behavior of TB17 Titanium Alloy During Isothermal Aging Process
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1.School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China;2.Jiangxi Provincial Engineering Research Center for Surface Technology of Aeronautical Materials, Nanchang Hangkong University, Nanchang 330063, China;3.Aviation Key Laboratory of Science and Technology on Advanced Titanium Alloys, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China

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National Natural Science Foundation of China (51764041)

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    Abstract:

    The precipitation phase evolution and the aging response of TB17 titanium alloy, a new titanium alloy with ultra-high strength and toughness, were studied by X-ray diffraction, scanning electron microscope, transmission electron microscope, and Vickers hardness tests during isothermal aging process. The results show that ββ+ω phase transformation mainly happens at 350 °C, and the precipitated phase ω is the shape of fine granular. After aging treatment at 450 °C, the α phase is nucleated through the assistance nucleation of ω phase. The phase transformation of ββ+α occurs at 550 and 650 °C and the α phase exhibits lamellar structure. However, there are two types of α phase precipitated after aging at 550 and 650 °C for long time: the Burgers α (Type 1α) phase which satisfies the Burgers orientation relationship and the Type 2α phase which does not satisfy the Burgers orientation relationship. The Type 2α phase is a twin crystal phase nucleated on the {102} twin plane inside the Burgers α phase. The aging characteristic of TB17 titanium alloy is similar to that of most β type titanium alloys. The aging response of TB17 titanium alloy is fast. The Vickers hardness of TB17 titanium alloy is increased firstly, reaching the maximum value at 450 °C, and then decreased with increasing the aging temperatures.

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[Luo Junming, Zhu Hongchang, Zhu Zhishou, Xu Jilin, Li Mingbing. Phase Precipitation Behavior of TB17 Titanium Alloy During Isothermal Aging Process[J]. Rare Metal Materials and Engineering,2021,50(11):3862~3870.]
DOI:10.12442/j. issn.1002-185X.20200680

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History
  • Received:September 08,2020
  • Revised:November 02,2020
  • Adopted:November 23,2020
  • Online: November 25,2021
  • Published: November 24,2021