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对多温度点人工时效(200℃/2 h、400℃/2 h、600℃/2 h)铀铌合金在冲击载荷作用下的绝热剪切带形成机理进行了研究,采用Hopkinson压杆装置对铀铌合金帽形样品进行了冲击加载,利用光学显微镜和扫描电镜对冲击后的回收样品进行了显微组织观察。结果表明,显微组织对剪切带的形成具有重要影响,只在200℃/2 h与600℃/2 h帽形样品台阶处观察到不同类型的绝热剪切带,400℃/2 h样品在冲击过程表现出韧性断裂与脆性断裂的特征,某些区域已经接近或达到熔点。
The formation mechanism of adiabatic shear band of uranium-niobium alloy under multi-temperature artificial aging (200 ℃ / 2h, 400 ℃ / 2h, 600 ℃ / 2h) under impact load was studied. The Hopkinson pressure bar device Uranium-niobium alloy cap samples were impact loaded, the use of optical microscopy and scanning electron microscopy of the impact of the recovered samples were observed microstructure. The results showed that the microstructure had an important influence on the shear band formation. Different types of adiabatic shear bands were observed only at the hatch samples of 200 ℃ / 2 h and 600 ℃ / 2 h, and samples of 400 ℃ / 2 h The ductile fracture and brittle fracture are characterized during the impact process, and some areas have approached or reached the melting point.