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Grain boundary character and microstructural evolution during hot deformation of a high Nb containing TiAl alloy
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State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an,State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an,State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an,State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an,State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an

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    Abstract:

    Grain boundary character and microstructural evolution during hot deformation of a high Nb-containing TiAl alloy with the composition of Ti-45Al-8.5Nb-(W,B,Y) have been investigated in this work. The plasma arc-melted alloy exhibits nearly lamellar microstructures with β/B2 phase precipitating along colony boundaries. The retained β/B2 phase rich in Ti, Nb and W and poor in Al is believed to be formed by the β → α transformation during nonequilibrium solidification. This β/B2 precipitation is caused by the relative high cooling rate, low atom diffusion rate of β stabilizers and different partition coefficient of the elements. B and Y elements exist mainly as borides and Y2O3, respectively. The morphology, size, composition and stability of β/B2 phase are determined by hot deformation. The high temperature and press enhance the elements diffusion, thus the variation of the composition of β/B2 phase in deformed samples is obviously observed. When the samples are deformed in (α + γ) phase region, the transformation β/B2 → α2 takes place. Considering the different crystal structures between β/B2 and α2 phases, there is a tendency for β/B2 phase to transform to an increased close packed structure of α2 during deformation. The β/B2 → α2 transformation is promoted by the hot deformation.

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[Ruifeng Zhao§,Huan Zhou§,Tiebang Zhang, Hongchao Kou, Jinshan Li. Grain boundary character and microstructural evolution during hot deformation of a high Nb containing TiAl alloy[J]. Rare Metal Materials and Engineering,2018,47(10):2927~2935.]
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History
  • Received:March 27,2017
  • Revised:May 27,2017
  • Adopted:December 13,2017
  • Online: November 08,2018

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