冲击加载下Al2O3/SiC复合陶瓷的动态力学行为

doi:10.3969/j.issn.1000-1093.2022.01.019

摘要/Abstract

摘要： 陶瓷材料动态力学性能与微观断裂机制研究，对冲击加载下材料的损伤机理认识至关重要。针对Al₂O₃/SiC复合陶瓷，采用分离式霍普金森压杆装置完成对试样的一维应力波加载，回收破碎试样颗粒并进行扫描电子显微镜分析。结果表明：一维应力波加载试验实现了对试样的均匀加载，且随着应变率的增加，Al₂O₃/SiC复合陶瓷的强度逐渐增大，具有正相关的应变率敏感性；受材料微观结构控制，Al₂O₃/SiC复合陶瓷的强度与致密化较高的Al₂O₃陶瓷（AD995、AD999等）强度较接近，强度随应变率变化趋势介于AD95陶瓷和致密化较高陶瓷之间；试样边侧受稀疏波的影响，存在大量沿晶断裂和少量穿晶断裂模式，且在穿晶断裂区域出现了剪应力引起的滑移线；试样内部碎片断裂表面较为光滑，更多的是穿晶断裂区域，只含有少量剪切滑移线，且在断裂核心区域的周围晶粒上并不存在微观解理断裂特征。

关键词: Al₂O₃/SiC复合陶瓷, 抗压强度, 应变率效应, 断裂机理

Abstract: The study of dynamic mechanical properties and micro-fracture mode of ceramic is the key to understand the damage mechanism of ceramic under impact loading. For the Al₂O₃/SiC composite ceramic, the split Hopkinson bar apparatus was used to impose the one-dimensional stress wave on a sample, and the SEM analysis was carried out on the recycled granules of fractured sample. Results show that the uniform loading of the sample is achieved by one-dimensional stress wave loading experiment. The strength of Al₂O₃/SiC composite ceramic is increased with increase in strain rate, which indicates the positive correlation of strain rate sensitivity for the composite ceramic. Due to the microstructure of material, the strength of Al₂O₃/SiC composite ceramic is close to that of Al₂O₃ ceramic (AD995, AD999 and so on). And the variaton tendency of ceramic strength with strain rate falls in between those of AD95 ceramic and high-density Al₂O₃ ceramic. A large number of intergranular fracture zones and a small number of transgranular fracture zones exist in the fracture surface on the side of the sample due to the influence of rarefaction wave on the sample. And a slip line under shear stress occurs in the transgranular fracture zone. However, the fracture surface of debris inside the sample is relatively smooth, and has more transgranular fracture zones and a small number of shear slip lines on it. The micro-cleavage fracture characteristics do not exist in the surrounding grains in the core zone.

Key words: Al₂O₃/SiCcompositeceramic, compressivestrength, strainratesensitivity, fracturemechanism

中图分类号:

O347.3

党泉勇，葛彦鑫，高玉波. 冲击加载下Al₂O₃/SiC复合陶瓷的动态力学行为[J]. 兵工学报, 2022, 43(1): 175-180.

DANG Quanyong, GE Yanxin, GAO Yubo. Dynamic Mechanical Properties of Al₂O₃/SiC Composite Ceramic Subjected to Impact Loading[J]. Acta Armamentarii, 2022, 43(1): 175-180.

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冲击加载下Al₂O₃/SiC复合陶瓷的动态力学行为

Dynamic Mechanical Properties of Al₂O₃/SiC Composite Ceramic Subjected to Impact Loading

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