高体份SiC_p/Al复合材料冶金缺陷的超声检测与分析  

Ultrasonic Testing and Analysis on Metallurgical Defects in High Volume Fraction SiC_p/Al Composite

作　　者：崔岩[1] 张演星 杨越[1] 刘峰斌[1] 

机构地区：[1]北方工业大学机械与材料工程学院,北京100144

出　　处：《热加工工艺》2016年第12期106-109,112,共5页Hot Working Technology

基　　金：国家高技术研究发展计划(863计划)(2013AA031202);北京市属高等学校高层次人才引进与培养计划项目(CIT&TCD20130301)

摘　　要：采用超声A扫描波形法对无压浸渗法制备的高体分数SiC_p/Al复合材料的铸件坯料进行了超声检测。结果表明,类疏松缺陷的波形有一定的宽度,且波形不光滑,底波衰减严重。造成这个现象的原因可能是在类疏松缺陷处表现为SiC颗粒间隙中没有铝基体,使得传播声波的介质由复合材料界面变为声阻抗更大的SiC颗粒界面,声波反射量增多。同时堆垛的SiC颗粒使得声波的散射增加,从而导致波形处杂乱且有一定的宽度,底波衰减严重。最后,采用超声C扫描成像法用以辅助、验证了波形检测的正确性。The casting billets of high volume fraction SiCp/A1 composite fabricated by pressureless infiltration were tested by ultrasonic A scan method. It turns out that the oscillograph of the composite with porosity presents to be wide and rough, with serious attenuation at the bottom wave. This is caused by the agglomeration of SiC particulates in the composite with porosity, which changes the media of sound waves from the interface of the composite into interface of SiC particulates with higher acoustic impedance. The acoustic reflection increases based on the above change and the scattering of the acoustic wave increases on account of the stacking SiC particulates simultaneously. Thus, it leads to the clutter and wide waveform and sevious attenuation of the bottom wave. Lastly, the ultrasonic C-scan imaging method is used to aid and verify the validity of scan testing.

关 键 词：SICP/AL复合材料 冶金缺陷 超声检测 

分 类 号：TB333[一般工业技术—材料科学与工程]