Meaning
Analytical technique used to determine the crystallographic orientation of microstructures within a solid sample by capturing and interpreting diffraction patterns from backscattered electrons. Engineers use ebsd texture mapping to evaluate the grain structure of copper interconnects or lead frames. Final maps show how the orientation of individual crystals affects the mechanical and electrical properties of the part.
Crystallographic Analysis
Diffraction patterns from the interaction of the electron beam with the tilted sample reveal the lattice parameters at each pixel. Software converts these patterns into color coded images where each hue represents a different crystal direction. This visibility allows researchers to see the preferential alignment of grains (which often results from specific deposition or annealing processes).
Process Validation
Quality control in Chinese advanced metallurgy plants involves this mapping to ensure consistency in high purity foil production. Adherence to the national standard for semiconductor grade copper requires detailed reports on the grain size distribution and orientation. An audit by the General Administration of Customs may include a review of these characterization data to verify the technical grade of imported raw materials.
National Standard
Measurement depth is restricted to the top few nanometers of the sample surface. Preparation must be perfect to avoid a strained layer that would obscure the diffraction signal.
