The cracking of materials and fracture surface is of great practical and academic importance.Over the last few years the development of the fractography of crystalline alloys resulted in Dishwasher Timer a useful tool for the prediction or failure analysis.Many attempts have been made to observe cracks using optical microscopy, X-ray topography and transmission electron microscopy (TEM).Of these techniques, the resolution of optical microscopy and X-ray topography is too poor.
By contrast, the resolution of TEM is high enough for detailed information to be obtained.However, in order to apply TEM observations, a thin foil specimen must be prepared, and it is High Current Connectors usually extremely difficult to prepare such a specimen from a pre-selected region containing a crack.