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| Microstructural Evolution for Ti-22Al-25Nb Alloy During Shear Spinning |
| WU Yang1, KOU Hongchao1, LIU Degui2, LI Jizhen2, TANG Bin1, LI Jinshan1 |
（1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China;
2. AVIC Manufacturing Technology Institute, Beijing 100024, China) |
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Abstract The effect of spinning temperature (910℃ and 1000℃ ) and reduction ratio (0, 10%, 30%) during shear
spinning on the microstructural evolution of Ti-22Al-25Nb alloy is investigated. The experimental results show that the
microstructure of Ti-22Al-25Nb alloy consisted of α2 phase, B2 phase and O phase. During spinning process, B2 grains
are elongated along the spinning direction. The equiaxed fine grains which distribute around the elongated grains are related
to dynamic recrystallization. The spinning temperature can significantly affect the size and morphology of α2 phase and O
phase. With the increasement of temperature, lamellar O phase become shorter and coarser, α2 phase tends to be equiaxed.
Deformation affects the volume fraction of α2 phase and the morphology of O phase. Obviously, the volume fraction of α2
phase decreases and O phase transforms from lamellar to clubbed as the increasement of reduction ratio. Thus, not only the
dynamic recrystallization and deformation of grains occur for Ti-22Al-25Nb alloy during shear spinning, but also involves
the complex phase transition which is difficult to control.
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2017, 
