Evaluation of TiAl and 40Cr diffusion bonding quality using ultrasonic reflection spectrum

作     者：栾亦琳 刚铁 

作者机构：State Key Laboratory of Advanced Welding Production TechnologyHarbin Institute of Technology 

出 版 物：《China Welding》 (中国焊接（英文版）)

年 卷 期：2007年第16卷第2期

页      面：72-76页

核心收录：

学科分类：080503[工学-材料加工工程] 0817[工学-化学工程与技术] 08[工学] 0807[工学-动力工程及工程热物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 0811[工学-控制科学与工程] 0801[工学-力学（可授工学、理学学位）] 080201[工学-机械制造及其自动化] 

主　　题：ultrasonic testing reflection spectrum diffusion bonding dissimilar materials 

摘      要：Combined with ultrasonic pulse-echo technique, reflection spectrum analysis was introduced to evaluate TiAl and 40Cr diffusion bonding quality. Frequency dependence of reflection coefficient was used to distinguish perfect bonding from imperfect bonding. It is found that the reflection coefficient from perfect bonding interface does not vary with frequency. When the size of imperfections is much smaller than the wavelength of ultrasound, the reflection coeffwient depends on frequency. When the size of imperfections is the same order of or even larger than the wavelength of ultrasound, the reflection coeffwient does not exhibit frequency dependence. However the amplitude of imperfect interface is higher than the amplitude of perfect bonding interface. A combination of reflection spectrum analysis and ultrasonic pulse-echo technique provides more accurate information about the bonding quality of dissimilar materials.