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采用扫描电镜,透射电镜和电子探针研究了钛与A_3钢爆炸复合界面层的电子显微组织。结果表明,复合界面具有明显的爆炸焊接的波状界面特征,波前呈旋涡状。界面层组织由中心细晶粒熔化区与邻近的高形变区组成。在A_3钢侧溶化薄层约3～15μm,层中细晶粒呈等轴晶其大小约为0.1～0.3μm,部分区域出现微晶和非晶组织.在Ti侧薄层厚些约5～35μm,细粒也稍大约0.1～0.5μm,不甚均匀。在Ii侧形变区出现大量绝热剪切带。在A_3钢侧呈现大量应力应变流线。晶粒被明显拉长,显示塑性形变特征。透射电镜观察至Ti侧高形变区有大量显微孪晶;A_3钢侧被形变拉长的晶粒内有大量位错缠结。电子探针分析表明界面层存在相互扩散和互溶但不明显,未发现Fe_2Ti金属间化合物形成。
The electron microstructure of the composite interface layer of titanium and A_3 steel was studied by scanning electron microscope, transmission electron microscope and electron probe. The results show that the composite interface has the characteristics of undulating interface of explosive welding, and the wave front is swirling. The interfacial layer consists of a central fine-grained melting zone and adjacent high-deformation zones. In the A_3 steel melt thin layer of about 3 ~ 15μm, the layer of fine grains equiaxed crystal size of about 0.1 ~ 0.3μm, some areas appear microcrystalline and amorphous structure on the Ti side of the thin layer of about 5 ~ 35μm, fine particles are also slightly about 0.1 ~ 0.5μm, not even. A large number of adiabatic shear bands appear in the deformation zone of Ii side. A_3 steel side presents a large number of stress and strain flow lines. The grains are obviously elongated, showing plastic deformation characteristics. A large number of micro-twins were observed in the high-strain zone on the Ti side by transmission electron microscopy. There were a large number of dislocations in the elongated grains on the A-3 steel side. Electron probe analysis showed interfacial diffusion and mutual solubility but not obvious, did not find the formation of Fe 2 Ti intermetallic compounds.