Macroetched

Macroetched refers to a microscopic examination technique used to reveal the internal structure of a metal sample. This process involves preparing a polished surface of the metal and then exposing it to a specific chemical etchant. The etchant selectively attacks different phases, grain boundaries, or other microstructural features at a rate that makes them visible to the naked eye or under low magnification. This macroscopic view helps identify larger features such as inclusions, porosity, segregation, and the overall grain structure. It is a common practice in materials science and metallurgy for quality control, failure analysis, and research purposes. The etchant and etching time are critical parameters, as improper selection can lead to misleading results or obscure important details. Macroetching provides a broader overview of the material's condition compared to microetching, which reveals finer details at higher magnifications.