Microstructural characterisation of polycrystalline ice with an etch-pitting replication method.

Area of Science:

• Glaciology
• Materials Science
• Solid Earth Physics

Background:

• Etch-pitting replication is a classical technique for characterizing ice microstructure.
• Advanced methods like cryo-EBSD have overshadowed replication for quantitative analysis.
• There is a need for accessible methods to quantify microstructural features in polycrystalline ice.

Purpose of the Study:

• To revive and re-examine the utility of the etch-pitting replication method for quantifying ice microstructure.
• To assess the method's effectiveness in determining crystal orientations and dislocation density.
• To compare replication results with advanced techniques like cryo-EBSD.

Main Methods:

• Optimized protocols for the etch-pitting replication method were applied to laboratory and natural ice samples.
• High-resolution scanning electron microscopy (SEM) was used to analyze replica films.
• Quantification of crystal preferred orientation (CPO) and dislocation density was performed.

Main Results:

• The replication method successfully quantified CPO and dislocation density in various polycrystalline ice samples.
• Results showed good agreement with cryo-EBSD data from comparable ice samples.
• The study demonstrated the method's capability to analyze ice with diverse CPO and strain levels.

Conclusions:

• The revived etch-pitting replication method is a promising tool for quantifying microstructural features in polycrystalline ice.
• This method offers an easy, quick, and affordable approach compared to advanced techniques.
• Further improvements can enhance efficiency, aiding in the interpretation of ice deformation mechanisms.