Effect of Rare Earth Yb2O3 on Superplastic Deformation Behavior of Laser Welded TC4 Titanium Alloy

Rare earth Yb2O3 of different contents was added to improve the superplastic deformation ability of laser weld of TC4 titanium alloy, and the superplastic deformation uniformity of the joint. The results show that the addition of Yb2O3 can reduce the flow stress of weld superplastic deformation, improve the elongation and increase the deformation uniformity coefficient K of the joint. With the increase in Yb2O3 content, the longitudinal peak flow stress and elongation of the weld first decrease and then increase, and the minimum peak flow stress is 11.9 MPa and the highest elongation is 592.3% when the Yb2O3 content is 6wt%. With the increase in Yb2O3 content in transverse deformation, the joint deformation uniformity coefficient K increases first and then decreases. When the Yb(2)O(3)content is 6 wt%, the maximum K value of the sample is 0.209.