SiCp/Al复合材料增强体分布均匀性超声成像方法

为提高SiCp/Al复合材料均匀性超声评价准确度,研究基于超声衰减及声速变化量的SiCp颗粒分布均匀性成像方法。制备不同SiCp体积分数的SiCp/Al复合材料试样;采用水浸式超声波系统对试样进行超声衰减成像,分析超声衰减量与SiCp体积分数关系;实验分析声速变化与SiCp体积分数的定量关系并对试样进行声速成像;采用金相法观测试样细观特征,分析不同SiCp体积分数下试样的材料均匀性变化,对比分析得出超声衰减和声速成像法的准确度和适用范围。研究结果表明,超声衰减成像方法适用于SiCp颗粒分布定性分析,基于声速变化量成像方法可定量分析SiCp颗粒分布,在材料均匀性评价方面具有更高准确度。

Ultrasonic imaging method for distribution uniformity of reinforcement in SiCp/Al composites

In order to improve the accuracy for ultrasonic characterization of the uniformity of SiCp/Al composites,the imaging methods based on ultrasonic attenuation and velocity for the distribution uniformity of SiCp particles were studied.SiCp/Al specimens with different volume fractions of SiCp were prepared.Ultrasonic attenuation imaging for the specimens was carried out by water immersion ultrasonic system,and the relation of ultrasonic attenuation with SiCp volume fraction was analyzed.The quantitative relation of ultrasonic velocity with SiCp volume fraction was analyzed experimentally,and ultrasonic velocity imaging of the specimens was carried out.Metallographic method was used to observe the micro characteristics of the specimens,and the material uniformity of the specimens with different SiCp volume fractions was analyzed.The applicability and accuracy of the imaging methods based on ultrasonic attenuation and velocity were comparatively analyzed.The results present that the ultrasonic attenuation imaging method is suitable for the basic analysis of the distribution of SiCp particles,and the ultrasonic velocity imaging method is more accurate and suitable for the quantitative analysis of SiCp particle distribution.