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Effect of Holding Time on Microstructure and Mechanical Properties of TiAl based Alloy
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1.School of Materials Science and Engineering,Nanchang Hangkong University;2.School of Materials Science and Engineering,TongJi University

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supported by the Research Fund of State Key Laboratory for Marine Corrosion and Protection of Luoyang Ship Material Research Institute (LSMRI) under the contract

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    Abstract:

    The TiAl-based alloy has excellent high-temperature comprehensive properties such as low density, high specific strength and high specific stiffness. It is expected to replace a nickel-based alloy with high density in aero-engine manufacturing. In this paper, the transformation rule of β2-phase and its effect on the mechanical properties at room temperature in the cast TiAl alloy were studied systematically. The experimental results demonstrated that the toughness of the cast Ti-Al-Nb-Cr-Mo-B alloy is not decreased when the holding time is 2h, but the strength increased from 1200MPa to 1500 MPa. In the process of heat preservation, α decomposes into γ + β phase, and then in the process of cooling, the disordered β phase transforms into ordered β2 phase. The experimental results show thatβ2 phase is a hard brittle phase, and a small amount of β2 phase can promote the strength of the alloy.

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[Zhang Runchen, Chen Qingjun, Gao Jiwen, Cui Xia, Xu Yong, Feng Aihan, Qu Shoujiang. Effect of Holding Time on Microstructure and Mechanical Properties of TiAl based Alloy[J]. Rare Metal Materials and Engineering,2020,49(9):3189~3194.]
DOI:10.12442/j. issn.1002-185X.20200020

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History
  • Received:January 08,2020
  • Revised:March 27,2020
  • Adopted:April 02,2020
  • Online: October 15,2020
  • Published: