High temperature and strain-rate response of AA2124-SiC metal matrix composites
High temperature and strain-rate response of AA2124-SiC metal matrix composites
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DOI：
10.1016/j.msea.2022.144014
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发表时间：
2022-09-22
期刊：
影响因子：
6.4
通讯作者：
Ayvar-Soberanis, Sabino
中科院分区：
文献类型：
--
作者：
Li, Xuan;Kim, Jin;Ayvar-Soberanis, Sabino
本文利用分离式霍普金森压杆(SHPB)压力仪对不同颗粒尺寸和质量的AA2124-碳化硅金属基复合材料(MMC)的动态冲击行为进行了研究。在应变速率为1000 S-1、2000 S-1和3000 S-1以及室温(25℃)、100℃和200℃下进行了力学试验，并对压缩前和压缩后的试件进行了微观结构分析，以研究MMC材料的断裂特征和机理。研究了材料的流动应力应变、应变速率、温度效应和变形机理。背散射电子图像表明，较高的应变速率会导致CuAl2析出相更致密、更细小，尤其是在碳化硅颗粒较小的复合材料中。温度对显微组织变化的影响较小。将样品加热到接近固溶处理温度，然后进行空气淬火，可以使CuAl2析出物得到细小的弥散，同时对于体积分数较高的碳化硅增强体，其饱和度也较高。SHPB压缩结果表明，225XF材料在所有材料中产生的应力最高。对于体积分数较高的材料(225Xe和225XF)，在高应变率和高温压缩试验中，样品中出现了裂纹和破坏，这被认为是由于强化的氧化物相导致材料的脆性增加所致。
This paper presents the results of the study of the dynamic impact behaviour of the AA2124-SiC Metal Matrix Composite (MMC) material with different particle reinforcement sizes and qualities using a compressive Split-Hopkinson Pressure Bar (SHPB) apparatus. Mechanical tests were performed at strain rates 1000 s-1, 2000 s- 1 , and 3000 s-1 and at temperatures of room temperature (25 degrees C), 100 degrees C and 200 degrees C. Microstructural analyses were carried out on the samples pre and post-compression experiments to study the fracture characteristics and mechanisms of the MMC materials. The flow stress-strain, strain rate, temperature effects and deformation mechanism were investigated. The backscattered electron images show that a higher strain rate of deformation induces the formation of denser and smaller grain size of CuAl2 precipitates, especially in composites with smaller SiC particle sizes. Temperature has posed a minor effect on the microstructural change. Heating the samples close to a solution treatment temperature, and then followed by an air quenching has resulted in a fine dispersion of CuAl2 precipitates, as well as a high saturation for the materials with a higher volumetric fraction SiC reinforcement. The SHPB compression results reveal that the 225XF material has developed the highest stress among all materials. For materials with a higher volumetric fraction of SiC reinforcement (225XE and 225XF), cracks and failures have appeared in the samples during high strain rate and high-temperature compression experiments, which is believed to be caused by the increased brittleness of the material as a result of intensified oxide phases.