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Investigation on the formation mechanism of 120o<111> twin boundaries in γ phase of a TiAl based alloy during annealing treatment in hydrogen atmosphere
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1.University of Jinan;2.Harbin Institute of Technology

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Fund Project:

the National Natural Science Foundation of China (51275132, 51705199, 51372101), Shandong Provincial Natural Science Foundation, China (ZR2017BEE055),

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    Abstract:

    The effect of hydrogen on 120o<111> twin boundaries in γ phase of an as-cast and as-forged Ti–46Al–2V–1Cr–0.3Ni alloy was investigated by means of annealing treatment in hydrogen atmosphere, and the microstructure was observed by an optical microscopy, a scanning electron microscopy, an electron back scattered diffraction technique, a transmission electron microscopy and a X-ray diffraction apparatus. The results showed that hydrogen could promote γ-phase static recrystallization of the as-cast and as-forged alloy, and the extent of static recrystallization increased with increasing hydrogen content. Many static recrystallization grains possessed 120o<111> twin boundaries. The relationship between the fraction of 120o<111> twin boundaries and hydrogen content was given. Hydrogen-weakened γ-phase elastic anisotropy increased 120o<111> twin boundaries.

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[Wen Daosheng, Wang Shouren, Shan Debin, Zong Yingying. Investigation on the formation mechanism of 120o<111> twin boundaries in γ phase of a TiAl based alloy during annealing treatment in hydrogen atmosphere[J]. Rare Metal Materials and Engineering,2019,48(9):2789~2993.]
DOI:10.12442/j. issn.1002-185X. E20180004

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History
  • Received:February 03,2018
  • Revised:April 04,2018
  • Adopted:April 04,2018
  • Online: October 09,2019
  • Published: