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利用分离式Hopkinson压杆实验和显微分析技术,研究了U-5.7Nb合金在应变率范围(102/s?104/s)内的变形特征和微观组织。结果表明:U-5.7Nb合金的动态屈服强度明显高于其静态屈服强度,表现出明显的应变率敏感效应;当U-5.7Nb合金应变率为4300/s,试件在应变达到64%时发生剪切破坏。材料内部形成了明显的绝热剪切带,剪切带在与压缩方向垂直的平面内呈环形,这与动态压缩过程中应力分布不均匀有关。
Deformation characteristics and microstructure of U-5.7Nb alloy in the strain rate range (102 / s? 104 / s) were investigated by using separate Hopkinson pressure bar experiment and microscopic analysis technique. The results show that the dynamic yield strength of U-5.7Nb alloy is obviously higher than its static yield strength and shows a significant strain rate sensitive effect. When the strain rate of U-5.7Nb alloy is 4300 / s and the strain reaches 64% Shear damage occurred. The obvious adiabatic shear band is formed in the material. The shear band is annular in the plane perpendicular to the direction of compression, which is related to the uneven distribution of stress during dynamic compression.