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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。
In order to improve the ultrasonic evaluation accuracy of SiCp / Al composites homogeneity, the imaging method of SiCp particle distribution uniformity based on ultrasonic attenuation and sound velocity variation was studied. SiCp / Al composite samples with different SiCp volume fractions were prepared. Ultrasonic attenuation imaging was performed on the samples with ultrasonic immersion system. The relationship between ultrasonic attenuation and SiCp volume fraction was analyzed. The quantitative relationship between the changes of sound velocity and SiCp volume fraction The microscopic characteristics of the samples were observed by metallographic method. The changes of material homogeneity under different SiCp volume fractions were analyzed. The accuracy and the applicable range of ultrasonic attenuation and sound velocity imaging were analyzed. The results show that the ultrasonic attenuation imaging method is suitable for the qualitative analysis of SiCp particle distribution, and the quantitative analysis of SiCp particle distribution based on the sound velocity variation imaging method has higher accuracy in material homogeneity evaluation.