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为研究Ti-5553合金在高应变率载荷下的动态响应和微结构变化,利用分离式霍普金森压杆(SHPB)和霍普金森拉杆(SHTB)装置对Ti-5553合金分别进行单纯SHTB加载和SHPB+SHTB加载,采用光学显微镜和扫描电子显微镜对加载后的试样进行观察,分析其显微组织和断口形貌,并结合定量金相分析方法进行相关计算。结果表明:SHPB加载和SHTB加载均会使Ti-5553合金发生应力诱发马氏体相变;Ti-5553合金在SHPB加载发生应力诱发马氏体相变之后再进行SHTB加载时,发生应力诱发马氏体相变的能力受到抑制;Ti-5553合金在SHPB加载后,材料的变形抗力降低,SHPB加载后再采用SHTB加载与单纯SHTB加载相比,材料的塑性变差、抗拉强度降低。
In order to study the dynamic response and microstructure change of Ti-5553 alloy under high strain rate loading, SHTB loading was carried out on Ti-5553 alloy by using split Hopkinson pressure bar (SHPB) and Hopkinson rod (SHTB) And SHPB + SHTB loading. The loaded samples were observed with optical microscope and scanning electron microscope, and the microstructure and fracture morphology were analyzed. The correlation analysis was carried out with quantitative metallographic analysis. The results show that both SHPB loading and SHTB loading can induce stress-induced martensitic transformation in Ti-5553 alloy. When SHTB loading occurs after SHPB loading in SHPB loaded Ti-5553 alloy, The deformation resistance of Ti-5553 alloy is restrained when SHPB is loaded, and the deformation resistance of Ti-5553 alloy is decreased after SHPB loading. Compared with pure SHTB loading, the plastic deformation and the tensile strength of Ti-5553 alloy decrease after SHPB loading.