The Path to Absolute Strain Measurement

Introduction High Angular Resolution EBSD (HR EBSD) is the tool by which residual elastic strain and stress maps can be mapped within polycrystalline samples.  Wilkinson Meaden and Dingley established it as a robust method in 2006 (1). As published, the technique provides only relative stress strain measurements.  This is because the technique relies on cross correlating […]

Grain boundary strain in nickel base alloy

Introduction High sensitivity EBSD, also known as high resolution EBSD is now in general use for the determination of elastic strain and very small rotations1.  Below are shown measured rotations, and normal strains using this technique to investigate grain boundary effects in an annealed sample of nickel based superalloy.     Figure 1 Rotation and […]

Strain measurement using EBSD and Raman

Introduction There are several established techniques that allow the measurement of strain in materials and structures on a macro scale such as X-ray diffraction and neutron diffraction. However, these are of limited value in the understanding of the microscopic, or nanoscale, strain characteristics that may help to improve the design of, or to understand failure […]