热处理对铀铌合金变形局域化的影响  

Effects of Heat Treatment on Microstructure and Dynamic Shear Localization of U-Nb Alloy

作　　者：石洁[1] 王小英[1] 赵雅文[1] 巫祥超[1] 

机构地区：[1]表面物理与化学重点实验室,四川绵阳621907

出　　处：《稀有金属材料与工程》2014年第11期2836-2840,共5页Rare Metal Materials and Engineering

基　　金：中国工程物理研究院科学发展基金(2010B0301046)

摘　　要：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。Dynamic deformation and failure behavior of U-Nb alloy with different heat treatment （200 ℃/2 h, 400 ℃/2 h, 600 ℃/2 h） were studied. Hat-shape specimens were used in an attempt to induce strain localization in U-Nb alloy. Dynamic load was applied to specimens by use of a Split Hopkinson Press Bar （SHPB） apparatus. The microstructure was examined by optical microscopy and scanning electron microscopy. Results show that the appearance of adiabatic shear bands （ASBs） is relative to the microstructure of material. Different kinds of ASBs are found in 200 ℃/2 h and 600 ℃/2 h specimens, while specimens （400 ℃/2 h） exhibit dimple-like feature, indicating that significant melting takes place during deformation under high strain rate loading condition.

关 键 词：铀铌 绝热剪切带 微结构 

分 类 号：TG166[金属学及工艺—热处理]