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Research Article

Evolution laws of microstructures and mechanical properties during heat treatments for near-α high temperature titanium alloys

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  • Received: 21 September 2020Revised: 7 December 2020Accepted: 5 January 2021Available online: 6 January 2021
  • Evolution laws of microstructures, mechanical properties and fractographs after different solution temperatures were investigated through various analyses methods. With the increasing solution temperatures, contents of primary α phase decreased, and contents of transformed β structures increased. Lamellar α grains dominated the characteristics of transformed β structures, and widths of secondary α lamellas increased monotonously. For as-forged alloy, large silicides with equiaxed and rod-like morphologies, and nano-scale silicides were found. Silicides with large sizes might be (Ti, Zr, Nb)5Si3 and (Ti, Zr, Nb)6Si3. Rod-like silicides with small sizes precipitated in retained β phase, exhibiting near 45° angles with α/β grain boundaries. Retained β phases in as-heat treated alloys were incontinuous. 980STA exhibited excellent combinations of room temperature (RT) and 650℃ mechanical properties. Characteristics of fracture surfaces largely depended on the evolutions of microstructures. Meanwhile, silicides promoted the formation of mico-voids.
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Evolution laws of microstructures and mechanical properties during heat treatments for near-α high temperature titanium alloys

  • Corresponding author:

    Zi-yong Chen    E-mail: czy@bjut.edu.cn

  • 1. College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China
  • 2. Pinggao Group CO., LTD, Sate Grid corporation of China, Pingdingshan 467000, China
  • 3. Aviation Industry of China (AVIC) Manufacture technology institute, Beijing 100024, China

Abstract: Evolution laws of microstructures, mechanical properties and fractographs after different solution temperatures were investigated through various analyses methods. With the increasing solution temperatures, contents of primary α phase decreased, and contents of transformed β structures increased. Lamellar α grains dominated the characteristics of transformed β structures, and widths of secondary α lamellas increased monotonously. For as-forged alloy, large silicides with equiaxed and rod-like morphologies, and nano-scale silicides were found. Silicides with large sizes might be (Ti, Zr, Nb)5Si3 and (Ti, Zr, Nb)6Si3. Rod-like silicides with small sizes precipitated in retained β phase, exhibiting near 45° angles with α/β grain boundaries. Retained β phases in as-heat treated alloys were incontinuous. 980STA exhibited excellent combinations of room temperature (RT) and 650℃ mechanical properties. Characteristics of fracture surfaces largely depended on the evolutions of microstructures. Meanwhile, silicides promoted the formation of mico-voids.

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