Extraction replica method from thinned transmission electron microscopy samples without floating off carbon films: A...

Area of Science:

• Materials Science
• Metallurgy
• Analytical Chemistry

Background:

• Reduced Activation Ferritic Martensitic (RAFM) steels are crucial for advanced nuclear applications.
• Understanding precipitate behavior in RAFM steels like UK-RAFM is essential for optimizing performance.
• Existing analytical techniques may have limitations in precisely locating and characterizing precipitates.

Purpose of the Study:

• To describe a novel method for producing carbon extraction replicas from twin-jet electropolished disks.
• To demonstrate the utility of this technique for tracking analyzed regions relative to the bulk sample.
• To analyze the precipitates within the UK-RAFM steel, focusing on chemical variability.

Main Methods:

• Twin-jet electropolishing of disk samples.
• Carbon replica preparation for transmission electron microscopy.
• Detailed chemical analysis of second-phase precipitates (SPPs).
• Comparison of experimental results with literature data and thermodynamic models.

Main Results:

• The carbon replica technique successfully allowed for precise tracking of analyzed regions.
• Significant variability in the chemistry of second-phase precipitates (SPPs) within UK-RAFM steel was observed.
• The chemical compositions of SPPs in UK-RAFM showed reasonable agreement with reported data for Eurofer-97.
• Comparisons with thermodynamic models provided further validation of the findings.

Conclusions:

• The described carbon replica method is effective for microstructural analysis of electropolished materials.
• The study provides valuable data on the precipitate characteristics of UK-RAFM steel.
• This technique enhances the ability to correlate microstructure with bulk sample properties in advanced steels.