Homogeneity testing of aluminum metal matrix composites by TIRP method
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摘要: 为检测碳化硅颗粒增强铝基复合材料的均匀性,利用与厚度无关声反射板(TIRP,Thickness Independent Reflector Plate)法对材料声速进行成像,排除了材料厚度的影响,提高了检测精度.介绍了TIRP法的基本原理和试验系统的结构,提出了一种基于双次扫描方式的TIRP实时成像方法,进一步提高了精度.利用底面反射回波法、单次扫描TIRP法和双次扫描TIRP法进行了试验,并对成像结果进行了比较,能够看出基于双次扫描的TIRP法可获得更准确清晰的声速图像.最后对误差来源进行了分析,指出了改进的方向.
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关键词:
- 超声声速测量 /
- 金属基复合材料 /
- "与厚度无关声反射板"法
Abstract: In order to evaluate the homogeneity of SiCp reinforced aluminum metal-matrix composites (MMC) fabricated by powder metallurgy, an ultrasonic velocity imaging was carried out with the method of thickness independent reflector plate (TIRP). Accuracy and precision were improved and the thickness was unnecessary in the velocity imaging with TIRP method. Firstly, the purpose of ultrasonic velocity imaging of MMC and basic principle of TIRP were introduced. Secondly, the structure of ultrasonic scan system was described. A double-scan method was applied to improve accuracy. Thirdly, the experiment results of ultrasonic velocity imaging of MMC specimen obtained with back surface echo (BSE), single-scan and double-scan method of TIRP respectively were compared and discussed. The images generated with double-scan method of TIRP have more details than those with BSE and single-scan method. Finally, the factors affecting accuracy and precision in the implementation were considered which may be used to advance the experiment. -
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