Stage-Rocked Electron Channeling for Crystal Orientation Mapping.

Area of Science:

• Materials Science
• Crystallography
• Electron Microscopy

Background:

• Microstructural analysis is crucial for engineering material properties.
• Electron Backscattered Diffraction (EBSD) is a common technique but has limitations in angular resolution and imaging conditions.
• There is a need for cost-effective, high-resolution orientation mapping methods.

Purpose of the Study:

• To introduce and validate a novel, low-cost orientation mapping technique as an alternative to EBSD.
• To demonstrate the capabilities of the developed method for microstructural analysis and defect detection.
• To explore methods for increasing the throughput and applicability of the technique.

Main Methods:

• A stage-rocked electron channeling approach was developed, termed Orientation Mapping by Electron Channeling (OMEC).
• This involves automated Electron Channeling Contrast Imaging (ECCI) with physical sample tilting/rotation.
• Computational reconstruction of Electron Channeling Patterns (ECP) is used to determine crystal orientation.

Main Results:

• OMEC provides a low-cost alternative to EBSD for orientation mapping.
• The method combines advantages of Selected Area ECP (SACP) and ECCI for enhanced local defect analysis.
• Dynamic sampling schemes were illustrated to improve throughput.
• The potential for constructing large 3D maps of challenging crystalline samples was demonstrated.

Conclusions:

• OMEC offers a viable, cost-effective approach for high angular and spatial resolution characterization of crystalline materials.
• This technique may open new avenues for analyzing complex microstructures.
• The method shows promise for routine analysis of bulk functional materials.