Non-contact ultrasonic measurements of the elastic constants of magnetic materials

R S Edwards, R Perry, D J Backhouse, I J Moore, D Cleanthous, A R Clough, D Stone
2011 Journal of Physics, Conference Series  
Ultrasonic testing using contacting transducers such as quartz or PZT is well established. However, standard measurement techniques used require physical contact of the sample and ultrasonic transducer and some sort of couplant between the two. With this configuration there is a possibility of damaging the sample, transducer or bond during testing, thermal cycling, or removal of the transducer. We present results taken using recent advances in non-contact methods of ultrasound generation and
more » ... d generation and detection using electromagnetic acoustic transducers (EMATs), which offer some significant benefits over contact ultrasonic techniques. Circumventing the need for couplant removes the possibility of contaminating the system, which is an issue for some material property measurements, and allows easier measurements over a wider range of temperatures. An automated data analysis system has been developed which allows the velocity of sound in the sample, and hence the elastic constants, to be determined to a high accuracy. This technique is illustrated using measurements of the alloy Gd64Sc36.
doi:10.1088/1742-6596/286/1/012050 fatcat:xw3eo5dsdndtfebi6fofwvicgm