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采用高温拉伸试验方法对5A90铝锂合金电子束焊焊板超塑性变形行为进行了研究。结果表明,焊板的断裂位置在母材部分,焊板接头可以承受高温变形而不破坏,但接头对焊板超塑性变形的贡献较小。随着温度的降低或初始应变速率的增大,焊板的应力应变曲线整体上移,在变形参数范围内焊板的峰值流变应力小于35.4 MPa。焊板的伸长率随温度升高和初始应变速率的减小而先增大后减小,在变形条件为450℃、5×10~(-3)s~(-1)时达到最大,为168%。焊板接头部分的塑性变形率随初始应变速率增大而增大,随变形温度的升高而先增大后减小,塑性变形率在变形条件为475℃、1×10~(-2)s~(-1)时达到最大,为92%。
The superplastic deformation behavior of the 5A90 aluminum-lithium alloy electron beam welding plate was studied by high temperature tensile test. The results show that the fracture location of the welding plate can withstand the high temperature deformation without damaging the base metal part and the welding plate joint, but the contribution of the joint to the superplastic deformation of the welding plate is small. As the temperature decreases or the initial strain rate increases, the stress-strain curve of the welding plate moves upwards as a whole. The peak flow stress of the welding plate in the deformation parameter range is less than 35.4 MPa. With the increase of temperature and initial strain rate, the elongation of the welding plate first increases and then decreases, reaching the maximum at the deformation of 450 ℃ and 5 × 10 -3 s -1, Is 168%. The plastic deformation rate of the welded part increases with the increase of the initial strain rate and then increases first and then decreases with the increase of the deformation temperature. The plastic deformation rate is 475 ℃, 1 × 10 -2 s ~ (-1) reached the maximum, 92%.