Surface Microstructure Evolution of Metallic Specimens Using the Large Chamber Scanning Electron Microscope

An initial study into the use of the large chamber scanning electron microscope (LC-SEM) to interrogate the surface microstructure evolution of metallic specimens has been carried out. The LC-SEM located at Western Kentucky University is the largest instrument of its type at any university in the world. As such, unique measurements can be performed due to the size of its chamber and extended view of its optic system. Strain was varied for each individual specimen, and imaged using Backscattered Electrons within the gauge length as well as near the grip position. Results will show the relationship between time to failure and nickel content of metallic specimens. Additionally, results will demonstrate the capability of the LC-SEM to carry out these types of measurements. Future measurements will include the incorporation of a in-situ uniaxial load frame for dynamic studies.