FIB/SEM 3D Crystal Orientation Analysis
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Solution Overview
Problem
Current methods for characterizing three-dimensional crystal orientation are either complex and require high-intensity light sources or involve significant workload and alignment challenges, failing to simultaneously and accurately obtain crystal structure orientation information.
Innovation Solution
A method using FIB/SEM dual-beam systems and EBSD patterns to acquire two-dimensional structure topographies, perform three-dimensional image synthesis, establish coordinate relationships, and extract crystallographic orientations, enabling accurate and simultaneous analysis of crystal three-dimensional orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If computed tomography with synchrotron radiation X-ray source is used to obtain three-dimensional microstructure, then three-dimensional reconstruction accuracy is improved, but light source requirement becomes very high and operation becomes complex
Solution Approach 1:
The patent replaces the complex synchrotron radiation X-ray CT system with a FIB/SEM dual-beam system. The FIB (focused ion beam) enables precise layer-by-layer sectioning, while the SEM (scanning electron microscope) captures high-resolution images of each section. This substitution eliminates the need for synchrotron radiation facilities and complex CT operations, achieving 3D reconstruction through a more accessible and operationally simpler system.
2Measurement precision
If computed tomography with synchrotron radiation X-ray source is used to obtain three-dimensional microstructure, then three-dimensional reconstruction accuracy is improved, but crystal structure orientation information cannot be obtained simultaneously
Solution Approach 1:
The patent merges the FIB sectioning capability with the SEM imaging and EBSD (electron backscatter diffraction) analysis functions into a single integrated system. The FIB creates cross-sections while the SEM captures images and the EBSD detector simultaneously measures crystal orientation. This combination allows both 3D structural reconstruction and crystallographic orientation analysis to be performed on the same sample sections without information loss.
3Measurement precision
If chromatography and topography observation are used to obtain two-dimensional cross section structure, then spatial structure topography can be obtained after three-dimensional reconstruction, but workload becomes large and alignment between layers becomes difficult
Solution Approach 1:
The FIB/SEM system performs automated layer-by-layer sectioning and imaging. The FIB beam automatically removes material in controlled layers, and the SEM automatically captures images of each exposed surface. This automated process eliminates the need for manual mechanical polishing and alignment operations, significantly reducing workload while maintaining high spatial structure topography accuracy.
4Measurement precision
If mechanical polishing and light mirror observation are used to image samples, then two-dimensional cross section structure can be obtained, but alignment between layers becomes difficult
Solution Approach 1:
The patent replaces manual mechanical polishing with automated FIB (focused ion beam) sectioning. The FIB system uses a computer-controlled ion beam to remove material layer-by-layer with nanometer precision, eliminating the need for manual polishing operations. This substitution not only reduces alignment difficulty but also enables precise control over section thickness and position, significantly improving the ease of operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for high-resolution, accurate analysis of crystallographic orientations, particularly suitable for micron-sized structures, and is applicable to various materials, enhancing material analysis capabilities.
Implementation Method 1
Focused ion beam/scanning electron microscopy (FIB/SEM) system has the capabilities of focused ion beam micro nano processing and scanning electron microscopy observation and analysis
Implementation Method 2
the electron beam to collect the relevant data of the cutting cross section
Implementation Method 3
acquiring an EBSD (Electron Back Scatter Diffraction) pattern in the area to-be-detected
Data Source
AI summary
A method for accurately characterizing a crystal three-dimensional orientation and a crystallographic orientation, including the following steps: acquiring a two-dimensional structure topography and an EBSD pattern in an area to-be-detected of a crystal material; using three-dimensional image analysis software to perform three-dimensional image synthesis through so as to obtain a three-dimensional topography; extracting a three-dimensional orientation of a characteristic topography in a coordinate system where the three-dimensional topography is located; and by converting the three-dimensional orientation into a crystallographic coordinate system obtained by EBSD, obtaining the crystallographic orientation of the characteristic topography. By using the method, the orientation of characteristic organization structures of various materials and the crystallographic orientation may be simultaneously analyzed, which has a great significance for research on the material crystal growth orientation and growth behavior.