Friction Weldability of a High Nb Containing TiAl Alloy
1
School of Materials Science and Engineering, Yangtze Normal University, Chongqing 408100, China
2
State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
3
Materials and Chemistry School, Zhongyuan University of Technology, Zhengzhou 450007, China
*
Author to whom correspondence should be addressed.
Materials 2019, 12(21), 3556; https://doi.org/10.3390/ma12213556
Received: 6 October 2019
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Revised: 24 October 2019
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Accepted: 26 October 2019
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Published: 30 October 2019
The friction weldability of Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y alloy has been investigated by optimizing process parameters and analyzing the microstructures and tensile properties of the joints. The as-cast alloy with a nearly lamellar (NL) microstructure and the as-forged alloys with a duplex (DP) microstructure have been successfully welded. All the joints have a severe deformation zone (SDZ) and a transition zone (TZ) between the parent metal (PM) and SDZ. SDZ, showing a biconcave lens geometry, has a maximum thickness of hundreds of micrometers at the periphery. TZ is hundreds of micrometers thick. All SDZs have a fine-grained DP microstructure with a grain size of a few micrometers. For the joint of the as-cast alloy, the TZ consists of deformed lamellar colonies as the major constituent and partially recrystallized grains as the minor constituent. For the joint of the as-forged alloy, the TZ is similar to both the PM and SDZ, showing a DP microstructure. The grain size, volume fraction of γ grains, and the remnant lamellar colonies all increase with the distance from the SDZ. All joints presented perfect metallurgical bonding. The strengths of the joints are higher than those of the corresponding PMs. This indicates that the studied alloy has good friction weldability.
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Keywords:
high Nb containing TiAl; microstructure; friction welding; recrystallization; tensile properties
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MDPI and ACS Style
Xu, X.; Lin, J.; Guo, J.; Liang, Y. Friction Weldability of a High Nb Containing TiAl Alloy. Materials 2019, 12, 3556. https://doi.org/10.3390/ma12213556
AMA Style
Xu X, Lin J, Guo J, Liang Y. Friction Weldability of a High Nb Containing TiAl Alloy. Materials. 2019; 12(21):3556. https://doi.org/10.3390/ma12213556
Chicago/Turabian StyleXu, Xiangjun, Junpin Lin, Jian Guo, and Yongfeng Liang. 2019. "Friction Weldability of a High Nb Containing TiAl Alloy" Materials 12, no. 21: 3556. https://doi.org/10.3390/ma12213556
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