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Materials 2019, 12(8), 1203;

The Directional Solidification, Microstructural Characterization and Deformation Behavior of β-Solidifying TiAl Alloy

School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China
Author to whom correspondence should be addressed.
Received: 27 March 2019 / Revised: 6 April 2019 / Accepted: 11 April 2019 / Published: 12 April 2019
(This article belongs to the Special Issue Alloy and Process Development of Light Metals)
PDF [6942 KB, uploaded 12 April 2019]


A β-solidifying Ti–43Al–2Cr–2Mn–0.2Y alloy was directionally solidified by the optical floating zone melting method. The microstructure is mainly characterized by γ/α2 lamellae with specific orientations, which exhibits straight boundaries. The β phase is randomly distributed in the lamellar microstructure, indicating that the β phase cannot be directionally solidified. The directional solidification of γ/α2 lamellae was not affected by the precipitation of the β phase. Hot compression tests show that the deformation behavior of the β-containing lamellar microstructure also exhibits the anisotropic characteristic. The deformation resistance of the lamellae is lowest when the loading axis is aligned 45° to the lamellar interface. Microstructural observation shows that the decomposition of the lamellar microstructure tends to begin around the β phase, which benefits from the promotion of a soft β phase in the deformation. Moreover, the deformation mechanism of the lamellar microstructure was also studied. The bulging of the γ phase boundaries, the decomposition of α2 lamellae and the disappearance of γ/γ interfaces were considered as the main coarsening mechanisms of the lamellar microstructure. View Full-Text
Keywords: TiAl; deformation; directional solidification; lamellar microstructure TiAl; deformation; directional solidification; lamellar microstructure

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Cui, N.; Wu, Q.; Wang, J.; Lv, B.; Kong, F. The Directional Solidification, Microstructural Characterization and Deformation Behavior of β-Solidifying TiAl Alloy. Materials 2019, 12, 1203.

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