Quick Evaluation of Potential Difference on Al/Al3Fe Interface in a Conventional Transmission Electron Microscope

The potential difference in material, which will cause the corrosion in a wet environment, has been imaged using electron holography [1], Lorentz microscopy [2] and DPC method [3]. We have been developing an alternative method to visualize the electric filed in a conventional electron microscope with a thermal electron gun [4-6]. We have tried to observe a metal and metallic compound interface Al/Al3Fe in a polycrystalline commercial material.