( 中南大学 材料科学与工程学院， 长沙 410083)
摘 要: 采用平板爆炸复合方法制备T2/QBe2复合板材， 并利用金相和扫描电镜电子背散射衍射技术对复合界面附近处QBe2和T2侧产生的绝热剪切变形及形变孪生的微观特征进行了观测。 结果表明：由于T2和QBe2在物理性能、 力学性能和热学性能上的差异，在爆炸载荷条件下只在QBe2中产生绝热剪切带，并且绝热剪切带内分布有十分细小的等轴晶； 带内晶粒取向基本相同， 带与带之间基体中的晶粒取向也基本相同， 且两者还存在较大的取向差； 爆炸冲击加载后， QBe2和T2两侧均产生了形变孪晶。
关键字: 爆炸复合； 绝热剪切带； 形变孪晶； 电子背散射衍射
（School of Materials Science and Engineering,
Central South University, Changsha 410083, China）
Abstract: The T2/QBe2 composite was prepared by flat plate explosive cladding method. Microstructure characteristics of adiabatic shear deformation and deformation twins on both sides of QBe2 and T2 were investigated by means of optical microscope and SEM electronic backscatter diffraction techniques. The results indicate that adiabatic shear bands appear only on the side of QBe2 under the condition of explosive cladding because of the differences in physical, mechanical and thermal properties of T2 and QBe2， there are very fine equiaxed grains in adiabatic shear bands. Orientation of grains in the adiabatic shear bands and between shear bands is essentially consistent, while there is large difference of orientation between grains in adiabatic shear bands and matrix. Deformation twins are found in both T2 and QBe2 matrixes after explosive loading.
Key words: explosive cladding; adiabatic shear band; deformation twin; electronic backscatter diffraction
